So again as all we know that the equipment system and drop chance sucks lol.. I suggest that you make an armory so that players can craft materials just like in ocean wars.. The event can be treated as a bonus way to obtain materials.. In this case players can have a more leeway in their equipment and have an edge to those people who spend money..
I qouted that the equipment system sucks because there are 8 sets I think and 2days for every event and a player can only have 5 chances per day.. So if you calculate it 1 in every 8 events that the set you want can appear so 1/8 = 0.125 percent.. And it also depends on the chnces you can obtain a loot so if I'm correct for non paying player obtaining a white set would take a 6-8 months to complete if you are doing lvl 1 monster.. So it really sucks