[DeuceKicker]

Often just following this 'binary' rule will be good enough to show a profit.

Someone posted an example of betting out with a small PP on a paired board. This would be a decision you need to make depending on what range of hands you can put your opponents on, how aggressive they are, etc... I like to bet out if my PP is higher or lower than the flop. For example, if I limped with 66 and the flop comes 422, or if I limped with 33 and the flop comes 449. In either case I can easily fold to a raise since I can't beat anything but a bluff raise. 55 with a flop of 883 is more problematic because you'll often get raised by A3s or somesuch and have a decision to make.

Another example might be when you flop an OESD--especially if your card is not the low card (e.g. you limped with 33, a flop of 245 is better than 456).

As always, paying attention to your opponent helps in this decision-making process, but failing that, a set-or-fold rule is probably still not -EV