[Andy B]

With Aces or Kings, it is still desirable to jam on third street if you have the best pair. The drawing hands will get an edge if they develop, but a three-flush is overwhelmingly likely to remain a three-flush on fourth street. I am leery of building a big pot with Queens and especially anything Jacks or smaller, but I think that your thinking is somewhat flawed. When you have a big pair in a multi-way pot, yes, you're going to lose most of the time. But say it's six ways to the end. You'll win perhaps 25% of the time, but you'll have put in only one-sixth of the money. That's a 3:2 overlay, and that's nothing to sneeze at. Building a big pot early can make pairsy hands hard to play on later streets, which is why I don't advocate jamming with Queens or smaller unless the other jamming players are screwballs.