Even though everyone hates it, it takes guts. I've been actually thinking about plays like this...and how likely it it is for someone to fold. I mean you're pretty much playing exactly like you hit a set. And how often does villain have 2 pair or better? The power of the all-in is scary, I made 2 folds to bluffs last night...w/ top pair and an overpair. You just don't know...if you're opponent doesn't have at least 2 pair, they're very likely to fold (as long as they're not calling stations).