Yes i kinda agree. BUT you can use Pascal's Wager for something. Namely to find out which religion is the best one to choose game mechanically.
You are going to encounter a problem with "best" there. The Pascalian argument seems to be ignoring the question of whether or not a candidate object of worship is
suitable, whether it really
deserves our devotion. (More on that below.)
There's also going to be a problem with the idea of "choosing" a religion. Can we simply will ourselves to believe something as easily as all that? In Pascal's case, I don't think that he was really trying to create an argument that would convince anyone to convert. He was trying to justify the rationality of his own already-existing Christian faith.
The right religion to pick (as they all have the same chance of being right)
Do we really know that all religious beliefs have the same chance of being right? I don't think that it's true. Some religious systems are kind of generic (perhaps proposing an unknown "higher power" that may or may not be reflected very imperfectly in all religious traditions) while other religious systems stoutly claim the inerrancy of tremendously involved mythologies and make very specific and testable claims about origins, cosmology, the etiology of things like disease, and miraculous historical events of all kinds.
would be the one with most to gain by believing it and most to loose by being non believer.
A major problem with spinning things that way is that it favors the most crude and savage sorts of religion. According to this hard-Pascalian argument, it would be most rational for us to believe that unbelievers receive the most merciless and abominable tortures in hell for all of eternity without any hope of respite, because that sort of vision would give us the most to gain by believing whatever it takes in order to avoid it.
I think that we see that kind of 'hit'em-with-a-club' rhetorical strategy being used over and over again in the history of religion, in hopes of scaring people into faith.
Unfortunately, it also has the effect of reversing God and Satan, turning Satan into the most sympathetic figure in the myth. Satan knows that he's a created being, he knows from the very beginning that his rebellion is doomed to failure, but he nevertheless takes the moral stand and says "NO!!!", refusing to bend a knee and worship omnipotent evil.
That's tremendous nobility, a kind of nobility that God could never understand.