Who is down for some random +100xp jackpots when you win a match. The chance of getting the jackpot could be 1 in 20 and the match would have to last for at least 2 minutes.
I don't understand what you mean, how are you going to credit 100xp.. Or am I having a blonde moment?
I wouldn't credit the xp, the game would. I think in 3v3 games it could still be a 1 in 20 chance for each user that wins.