If you listen to or read interviews with some of poker’s top players, the vast majority of them will admit that it is becoming increasingly difficult to win money from the game, especially online. As more and more information floods into the poker community regarding how to play optimally, players become more knowledgeable and the games grow tougher.
That is not to say that there is not a lot of money to be won from playing poker online, because there is. You do, however, need to look for and push any edge that you can find or create for yourself.