-snip
this sounds reasonable,also it gives people incentitive to promote your game
for a PVP game to be a success there must be players,ideally,all the time online
for that you should find ways to attract them,one of the best way-affiliate
but you should be aware of the potential cheat attempts where people self refer or create alt accounts for the sole purpose of getting the rewards
think of a system where you both incentivize players to promote and make sure you don't go bankrupt because of a few "clever" individuals that take advantage of you