If you really wanna fix this game, design a new map with new bosses which drop onyx weapon parts with upgrade-like stats on them. As well as add a chance to obtain a weapon part exchange ticket into the Time boxes(+18 and +21 ones). (weapon consists out of 4 parts). Each boss would have a chance to drop parts for a specific kind of weapon, the ticket from time boxes can be used to obtain any weapon part. Weapon part tickets could be given away during events as well but should NOT be sold on the IM.
This way farmers (high lvl will compete for bosses) and low lvls have a chance to farm time boxes to get the parts as well, the parts should be tradable ingame and on the EM. At the same time PWI makes more money of the sale of Novice Pres stones for boxes.
Promote pvp/farming --> more players --> more people buying consumables (Ases/patterns/scrolls etc.) --> more stabilized income for PWI (and less P2W) everyone is happy
Laters noobs~~