[PantsOnFire]

Personally, I believe collusion won't give you a very big edge. Let's take an MTT. Some easy collusions are telling your partner your hole cards and chip dumping. Knowing two extra hole cards could help you a little most of the time or perhaps a lot in certain instances. Small edge maybe.

If one partner builds a big stack and the other is short stacked, the dumping chips from one to the other should be +EV although how much I am not sure, but it's probably not much. This might happen a bit in casino tourneys where you end up heads up with your buddy and you either fold the best hand to give him some chips or you refrain from busting him with the nuts.

Other forms of collusions involving strategy are certainly more difficult to pull off. The whipsaw, or reraising a victim in between you might be one of the more simple forms. But how often will you be in that situation. And once and a while, the victim will have a better hand than both of you.

I think the +EV aspect of collusion is very overrated, especially online or in MTTs where you don't choose your seats or tables.

I believe collusion is at it's worst when either a) a bunch of guys invite a noob or two to their game or b) a couple of friends go together (perhaps separately) to a new game and work to bust it. In both cases, I believe it is the home game scenario that is most susceptible.

I may be naive about this but two players who are good enough to go to a casino and collude successfully are probably good enough to do well on their own.

And at the other end of the spectrum, if two bozos try to collude thinking they are getting the upper hand they actually might end up being -EV. Now that's poker justice.