I disagree. School tuition is expensive enough without adding the cost of rent/food.

There are too many factors to consider to be able to give a simple yes or no answer. It depends on the cost, the age of the student, the educational opportunities (or lack thereof) at home, and whether the student would be able to cope with being separated from his or her family. 

Parents is everything for me. So, I think I'd like to stay with them. Study abroad is not always a guarantee of success.

If you want to go abroad for further study, but your parents hope you can stay at home ,or they will be lonely beccause you're their only child, what is your decision?

I think it depends on the purpose and also the cost