After the Red's event, Efren got screwed by his financier. The guy didn't give Efren all his share of winning through the side betting. He spend about 8-9 years out of the US because he has no financier. Then he was again picked up by an American gambler (eerrrr... financier). He came to US purely for money. It's not greed; it's his job. It's how he makes a living to feed his family.
Some experts today are debating why Reyes had many second place finishes early in his career in the US during his prime given that he is a gambler.