Probably because as you mentioned it can be quite expensive in certain areas of china to attend school even for toddlers and kids at age 3. You would have to understand the differences in quality also. Many schools here will charge a lot but won't really provide much for the kids. I went to one school(taught) for awhile and the meals they were getting were way below the standards of what I was used to. They don't have eye checkups I don't believe because I've never seen them do it. 

There is just a big difference if you were going to school here as opposed to going to school in the states. I can agree that learning chinese while attending school is a plus. It really has to come over quality over quantity. Most not all larger schools here in my opinion won't have the same type of quality that you can find back home.

I do not know of anyone locally with those ideas in mind, so it would be hard for me to venture a guess.  But being quite familiar with grammar school situation here in China, if the kid was born here, per Chinese Law he is guaranteed grammar school education free of charge.  Yes, it is also true that a few more famous schools (the better ones, or at least with that reputation), will require a "donation" to enroll the kid at school, but in my case was a 5,000 Rmb for a "new building fund".  And yes, they do not get free books or supplies, nor they get free food either.  But following close my daughter's education, she in some areas is ahead of what kids in USA learn at that age, especially in Math.

Otherwise, I would not venture a guess, only maybe to add that it is probably felt by those not totally happy with their stay in China.

I work in a high school, and I've worked in two middle schools. They spend most of their twelve hours in the classroom, six or seven days a week, learning math, physics and racial hate. Everything else is taught at an elementary level. For example, their biology is little more than "this is an arm, this is a finger."

I would never want my kid's brain scrambled in that way. Especially considering that kid would be quarter white/quarter black, I don't want him to think of half of him/herself the way Chinese kids are taught to think of foreigners in school.

I don't know about elementary, but the curriculum is made by the same people and can't be much better. And if my child is going to go through the trouble of learning to read and write Chinese, I want him/her to learn traditional characters, not that ugly garbage they teach here. And Classical Chinese, so they have some access to the five thousand year history and the best aspects of Chinese culture. I found out that in Canada, weekend chinese-writing schools for second-gen Chinese kids teach Classical Chinese and a level higher than grade 12 here. There is no greater joke in the world.

Even if I had a lot of money, I wouldn't like my kids to go to a Chinese or International school in China. This is just my opinion, based on what I have seen and heard, rather than being my kid and myself involved in that situation.

Chinese school:
1) Chinese schools, even though they can be public or private, tend to standardize their curriculum according to government requirements on what is important to be taught : science, math, english, etc. Other activities, namely, sports, arts, etc, are often not taught at all.
2) Parents often have to bribe the school to have their child accepted, especially good public or private schools. A school wanted that a friend of mine buy a piano. 
Parents are also supposed to bribe the teachers so that they take a better care of their children, instead of insulting them. This kind of practice or attitude from an institution that is supposed to teach and raise children according to moral principles is simply unacceptable for me.
3) The food provided is often of bad quality, and to think about the good health of children, mixed with sauces, grease and other things.
4) A Chinese school cannot afford a child to be open-mind and critical of what he is taught; he must just listen to the teacher, glue things into his mind, and repeat it when needed. If not, he will consider a bad student.
5) If the public school is not labelle and approved as "international" by the government, it won't accept foreign children. This attitude is also unacceptable. What if in Western countries, we decided to segregate Chinese-born children and deprive them of their rights to attend schools like any other children....Chinese embassies abroad would be the first to react and call it "racism". But for China, it's a normal attitude (they are maybe scared that foreign children influence the government propaganda at school)

International School:
1) They are extremely expensive, and except if a family can manage to live with an Expat package (which sometimes include tuition fees), then your child is simply left out of the system and you have no other choice than to turn to a Chinese international school.
2) By putting children into an international school, they can certainly learn good values and foster their creativity, but there is also the side-effect : they may tend to "elitism" as little by little they understand that they are privileged compared to other Chinese children, and eventually find themselves better (despite, the good willingness of the parents).
3) They often have "ayi" to do the dirty work for them or who stay around them.
4) If a family put their children into an international school because their "expat package" or their own salary allow them to do so, it will be a nightmare for the family and the child, if this "expat package" or the salary is lost.....

Frankly speaking, education is now the main reason that made me decide to leave China in a couple of months and go back to my home country. It's not perfect there, but at least I won't have to pay for the school and the quality would be more or less the same as in a international school here.

We are parents of two small children and we chose to raise them in Australia.
1 the schools are free
2 the enviroment in general is better and has less polution.
3 we have a back yard that is safe and  for them to play in.
6 free health care
7 goverment rebate on child care and a tax benifit
8 security is better
There are many other ressons both because of money and lifestyle
If it was only me and the wife we would be in China because it is better for me and her.
and when the kids are grown we will go to China full time.
and the Kids will have options what they will do in there own lives.

I would never let my kids be born there but I would let them live there it ant all bad