I don't think the SAT is really that useful of a test. However colleges seem to use them for entrance criteria, as a number is easier to evaluate than judging a person on the whole.
But if they are willing to cheat on the SAT test to get in, I don't think colleges really want people of such questionable moral caliber to enter the school.
My experience with Chinese students, this isn't too surprising, they are far more willing to cheat, than take the consequences of getting a low grade. That is why when they show statistics showing where China is succeeding, I really question it, because their culture seems to want to win, with the actual objectives of the grading as not important. A Sr.Year computer science major the student was the curve breaker on the tests. Went to me asking how in C++ can he use decimal numbers (the answer was using the float data type, which we learned about on day 3 in the freshman class, and had used such a data type all threw the program. Made me realize, this student was either cheating technically (threw nefarious methods), or cheating himself (Only test prep, once the test is done, it brand dumps out of the system). Because in anything practical he was useless.