The worst thing about this film is that the entire premise of the movie made no sense, once the viewer gets to the end and learns everything that's going on.
Remember "The Sixth Sense", where you learn a major surprise at the end which fits in with everything weird that had happened earlier in the movie?
"Runner Runner" is pretty much the opposite.
Basically, it comes out that Block was stealing all of the money on deposit, Full-Tilt-style, and had stolen so much that he planned to flee Costa Rica soon.
If so, why was he having a major affiliate convention at the beginning of the movie, attempting to attract business to a site he's about to close?
Why was he bothering to run superusers on a site where almost all of the money on deposit had already been stolen?
It's never even explained whether the superusers were really rogue programmers (as Block claimed) or actually Block himself. It is sort of implied that Block stole from Richie intentionally to set the entire thing up, but how could he know that Riche's reaction would be coming to Costa Rica personally?