I wouldnt go as far to say that bluffing is a waste of money at those levels, I play the levels and I can put in a bluff or two.At this level most people just look at their own cards, dont really think too much about your cards, if you think they have a flush draw, and they might chase it to the river, if it misses, put in another big bet they will let it go.They give alot of respect to bets, also you should too, when the str8, or the flush becomes possible and they bet big, just let them have it, i've noticed(and paid for) that the amount of times they dont have it, isnt worth the pot you gai