Battle Arena Gang Rewards/Battle Arena Points.
 

I would like to get in battle arena, arena points with that we could buy some items in a battle arena point shop or gang reward/s for the most battle arena wins in a month for example.

I personally feel if we tried adding exclusive weapons now for every concept of the game it will just become a real difficult task to balance everything.

Example being, arena point shop has way less items than gp shop and hs shop and pk/spar rewards