Depends on your definition of "bad cards". I see 7 4 os in BB, I think "Low flop = big pot to me". Depending on game level/type, it's not about the cards you hold, it's about how to take advantage of the situation presented to you. If the flop comes 8 high, chances are (yes you're probably beat but that dosn't matter), nobody connected, and a fairly stiff bet just might take the pot. They think "Shit, BB hit two pair with two randoms..." or something like that. Sometimes it dosn't matter how bad the cards are if you keep your eyes open to the situations that may be good for rags.