[RobNottsUk]

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Guys I think you need to learn more about plo/8. He is RIGHT to fold nut lows and nut low draws unless he has outs for high. The objective of PLO/8 is to scoop. Getting quartered is usually very bad.

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On the river, it is entirely possible that the OP could have the nut Lo only, when his Hi draw did not come home eg) Nut Lo + Nut Flush draw on flop, or when his great Hi hand is outdrawn. Furthermore subsequent play on turn by the other opponents could convince the OP that he was quartering the Lo, not going for a scoop.

That is a new situation, and you still must try to take decisions which are profit maximising. That might include, calling particularly if you close the betting, as it may be the least -ve EV option. When you fold you guarantee a loss, and as bbartlog agreed check/folding consistently is exploitable.

Actually I think poor players might also stumble into this "exploit", simply by betting if they have the nuts in either direction, not realising when they are likely to be quartered. On the other hand those players are also the ones more likely to pay off with non-nut Lo's.

The check, check, bet pot, call, call scenario was only an EV of 0, but that was better than folding.

Betting small, with bet, Nut Lo call, raise nut Hi, is not a good situation; because the pot size is bigger, the Hi can raise more.

With bet small 20 with idea of suppressing a larger 'steal' bet from another Lo, call, raise pot, goes :

100 -> 120 (20 bet)
120 -> 140 (20 call
140 -> 320 (20 call, 160 raise)
320 -> 480 (160 call)
480 -> 640 (160 call)

Now you have call 160, to win 1/4 640, which is EV of 0 on that call, but you lose -20 on the river overall as you put in 180 to win 160 back when you are quartered by another nut Lo, and lose your pre-river investment in addition. Unsatisfactory, but may be better than check/folding, if you're going to avoid 1/2 pot steals, and may sometimes pick up lose calls. Should the other Nut Lo player, be good enough to fold to minimise his losses, then you actually would profit in the hand.

One of those weird multi-way situations, where you want one of your opponents to play well.