I really think the cash shop gears should be obtainable in game without paying cash or make the quest available to VIP users only. A lot of these cash shop gears are so powerful it made a lot of in-game gears useless, creating little incentive to actually hunt those gears down. Costumes are fine being cash shop exclusive. I understand the issue with bots and RMT, so maybe it could be a character bound and only the cash shop variants can be traded.
It kind of defeats the purpose of RPG game. Instead of killing mobs to find decent loots, you instead throw cash at the screen for loots in order to kill the mobs.