[pzhon]

There are declining marginal returns if you normally use good game selection.

According to PokerTracker, my win rate is greatest on Friday nights and Staurdays. I don't think my play is much worse at other times. I think it is just that there are more donators playing (and drinking) at those times relative to the number of sharks. Last weekend, some of the plays made me check to make sure I wasn't at a play money table. A guy raised, then called my limp-reraise and flop 1/2 pot push with 32o unimproved. I didn't win that pot by playing well. I won because my opponent hated money.

If I wanted to play 10 hours per week, I could make sure to play them all at peak times. That's not possible for 50 hours per week, so it would be unreasonable to assume that I could make 5 times as much.