Also someone kind of alluded to this, but the fish are the same at each level, or near enough. Once you learn to really exploit fish (personally I think this is my strongest point at the table), its just a matter of finding them and getting good position on them. If all you do is pass blinds between yourself and the regs you'll still make your profits from the fish, especially since a lot of regs dont get that and do a poor job of exploiting them (its always funny to see a huge waiting list of regs targetting one specific fish then when they sit down they play the same as they would v's anyone else).

Over time you'll learn to exploit regs too, but learning the tendencies of fish and how to exploit them is the $'s for starters.