I haven't yet seen an answer to Pascal's Wager on LW that wasn't just wishful thinking. In order to validly answer the Wager, you would also have to answer Eliezer's Lifespan Dilemma, and no one has done that.
I'm pretty sure Peer meant the original version of Pascal's Wager, the argument for Christianity, which has the obvious answer, "What if the Muslims are right? or "What if God punishes us for believing?"
It has been claimed on this site that the fundamental question of rationality is "What do you believe, and why do you believe it?".
A good question it is, but I claim there is another of equal importance. I ask you, Less Wrong...
What are you doing?
And why are you doing it?