They use alts to abuse the gaming system for their own gain or because they are bored. Majority of the time where trading/exchange exists in games, people make alts to abuse it since early game tends to give lots of items. In our games, people use alts to farm coupons in convoys. It didn't take long to figure out this once the game started.

Not a lot of gaming companies will offer exhange system that is generous. The redeeming frags for iruka/6 tails naruto and seal/summon scrolls is the closest one to the suggestion but Tencent should have at least updated the refinement system once they added more characters to make players at least interested in farming for unwanted frags.