I also suggest such ideas like Dodger's ones, to make an use of the money you trade/smuggler/work for, more than just for the ammo and battles/PvPs you do.
That would also motivate people to do more trade, and mercenary/pirate/smuggler jobs to earn money, to keep up with those who do RP and got more or less rich from it. The more we can do with money, the more people will work for money, that equals to RP and fun, at least action, outside the Arena.