The 7-10% figure is what I have always heard. I was a bit startled/discouraged when I first heard this, but I don't think the news is nearly as bad for a player who is willing to put in the time and learn the game.

First of all, I believe somewhere between 20-40% of the people who play have no interest in learning the game. They just treat it like any other casino game. Second, I think there is a fair percentage of people who would otherwise be winning players if they did a better job of game selection and controlling themselves. I'm talking about things like moving up to quickly or playing higher than you should because your ego won't let you move down. There's also the factor that a lot of poker players tend to be gamblers and that can cause all sorts of problems.

I believe that for a reasonably intelligent person with good discipline and decent logic skills who is smart with game selection and bankroll management it's not that hard to be a winning player. The reason there aren't that many winning players is because people usually fall short in one of these areas.