Agreed however they also can be bluff finders as well.
Slightly off topic (maybe deserving a new thread not sure)
Example: You limp A
J
EP, 2 other limpers and BB checks. We'll say $22 in pot (2.5 game)
Flop comes : A
7
3
BB checks, you check , next check, button bets $20 , BB folds you call other player folds.
Turn comes 8
You lead $60 and are called.
River comes 2
Issue: Our hand is probably best at this point, opponent may have a whiffed draw that he picked up on the turn or a weaker Ace/pair. Obviously if we knew he had a whiffed draw we'd check/call to let him bluff and if we knew he had a pair that he'd call a bet with but check behind we'd bet but then the question becomes how big of a bet will he call and will our bet be too big in the sense that nothing that we beat will call.... it's an interesting spot for a weak lead fake blocker bet type bet...of say $35. I think this $35 will be called a decent amount of the time by weak pairs/aces that would have checked behind AND would have folded to a larger bet.... but also i think it will induce whiffed draws to attempt a bluff raise a decent % of the time as well.... so if they bump this bet to $150 or so -- keep in mind if we bet the river (normally), it's not THAT much more than we would have value bet -- so we can call here (lightish) hoping we set up the bluff, thus gaining value out of both weaker made hands and whiffed draws.... Against Rocks etc this obv doesnt apply