Combo decks like Eggs are better at pulling off their combo engines if they don't run win conditions. This is a simple statistical truth. This means that a player can gain advantage by sideboarding out all of his win conditions if his opponent is willing to concede to the engine coming online.
The Bribery argument seems frankly ridiculous to me. The decision is based entirely on the presence or absence of a way to win in my opponent's deck. I just want to know with certainty “Will you win eventually if you follow this to its logical conclusion?” There is absolutely no outside incentive here. I'm not trying to get any outcome different than the one the game would naturally reach. I just don't want to be forced to concede without knowing a win is possible or watch my opponent waste huge amounts of time that should be spent on subsequent games trying to bluff me into such a concession when he can't actually win.
EDIT: To be clear, I am not certain that “Can I search your library for literally any win condition?” is a request that I can make or my opponent can honor, but I am certainly not going to call it Collusion & Bribery if a player does this. If this is Cheating (and, full disclosure, I don't think it should be), it would be a Hidden Information Violation. I think if there is an infraction here (not sure there is), it is probably Looking at Extra Cards.
Edited Joshua Feingold (Oct. 23, 2012 09:03:32 PM)