Reasons
1) Because when they don't play well, it puts them in a state of poverty.
And if you haven't eaten for 3-4 days, you really concentrate on winning the next game or set. (assuming you have a backer).
2) They play more money ball over there, all the time, which means it is more competitive, and therefore more challenging.
3) Filapinos, I have found, are a smart people as a whole.
4) Winning in Billiards over there is a source of National Pride and recognition, and is recognized by the government.