This sounds pretty fun. I'm not usually into pvp, but I'll have to try this out! It looks like some strategy is going to be involved, along with a lot of luck. Hehe. And no house edge? Very cool.
Will you impliment an investment program?
Its a more competitive game since you will be playing against another player.
To the argument of players chance to win or lose, i think 50% is the average chance. See, 2 players 4 games, 4 chances to hit or miss the other. Even if you lose 4 games straight, the provability of you winning 4games straight is there.