Statham (and to some degree 50 Cent) only exist in this movie as characters to draw in the audience.
The whole premise is another kind of perverted rich-people-don't-know-what-to-do-with-their-money game.
Sam Riley does a good job, though.

Still, the whole film isn't per se bad but it lacks depth, it lacks resolution, it lacks proper closure.
At the end it's like everything in this movie was pointless.
Sure, Vince got the money, but that is hardly a good ending and with good I do not mean happy ending. Some movies not ending on a good note is fine. But in this, there's no moral to the story either that I would buy into, making the end worthwhile. The movie doesn't care about that. There are no questions asked in this movie whatsoever.
Additionally, everyone in this was so tense, from giving out guns, to giving orders, to doing the bets. Everything was tense, making this hardly entertaining but rather stressful to watch. To some degree I can understand the tension given the circumstances but not all the time.