I got tired of losing to these poor players, so I went to Bellagio and won $15000 playing against Phil Ivey in a high stakes cash game. He was easy to beat compared to the people who had no idea what they were doing.

Ok, I digress. Bad play doesn't cost you money. You just have to adapt to it and factor it into your strategy. Sometimes what you think of as bad play is just "erratic" behavior from newbies. You have to separate unpredictible behavior (good play) from suboptimal erratic behavior (poor play), and then you'll have a better idea how to crack the low limit games.

Also, you can't play in games where the rake is killing you. High stakes games and tournies generally aren't raked as harshly.

P.S. Your question has been answered many times in this forum. Search the past and you'll find some good stuff.