I do it on occasion, just short on funds right now. And yea the subpennys are tricky, one second you could be up 400% and then down 25% the next. The problem with subpennys is that once you're good and have a fair amount of money, its tough to move that money through the stock. Say you got $10,000 to play around with, that amount could buy the entire float of some subpennies lol. Not that you should ever invest $10,000 in a single penny stock, but you get what i'm saying.