[Iceman]

It's very common in Omaha for someone to have the absolute nuts, while it's very rare in holdem. If a holdem player massively overbets the pot, even if he has a strong hand he is taking a huge risk that someone will have one of the few hands that beats him (and in the rare case that the overbettor does have the absolute nuts, he'd probably want to play it in a way that would be more likely to attract action). In Omaha, even if you have the nuts on the flop or turn there are usually lots of cards on the next round that could potentially give someone a better hand. So in pot-limit Omaha, you're usually forced to bet out a strong hand in most situations because it would be too risky to give a free card. In no-limit Omaha, in most situations where you had the nuts you'd rather just go all-in (knowing that you can't be beaten) rather than face further action (which gives the drawing hands an even greater value than their pure odds would indicate since they have the opportunity to either bluff you or to get paid off on some of their outs), and that would eliminate much of the skill in the game (which revolves around how to respond to scare cards on the turn and river). In no-limit holdem, where strong drawing hands are much rarer so free cards aren't necessarily disasterous, it's often a difficult decision whether to bet out, check-raise, or slowplay a strong made hand.