I see where you are coming from. Because I do my serious play live, I see all sorts of players, and an unfamiliar player is almost as likely to be a tight-aggressive or a nit as he or she is to be a fish. So I try not to make stupid mistakes when I have just sat down. It's more profitable to wait until I have identified people's tendencies.

Online, perhaps people are more predictable. When I play online, I play at pretty low stakes, and I do see lots of loose players in both limit and no-limit.