Since you have people who have a collection of 5* items, shouldn't there be a enhancing system, besides UV's that can make your weapon even more stronger based on various of stats? Instead of putting 6, 7, 8, 9, 10 star gear into this game, wouldn't it be a great idea to add another LAST gear improvement system to gear?
additional enhancement stats like (made from my head off of the MMO/RPG games I play):
Crit damage
Damage boost
Damage bonus
Damage reflection
Status boost rate (fire, shock, freeze, stun, sleep, curse, poison)
Siphon rate (every hit or damage you take you heal back)
What you're asking for is a greater amount of cash/effort to spend on the game in exchange for more power to those spending when the game is already out of reach for most players.