Haha, yes, if it has seeds it means it's not as good, usually. But this is because when the female plant is pollinated, it stops producing THC. And most people who grow take out all the males to prevent the pollination, unless they plan on breeding. If I'm wrong, correct me. And I'm sure I'm wrong on some aspect here... I'm really stoned.

P.S. if there are seeds in the bud it usually means it was unintentional, otherwise they'd take 'em out to plant them. But of course, dealers don't care, because seeds add to the weight.