Archaic mechanics in Maple.

I think the best compromise to the cash shop situation would be to make the inventory shared between all characters but require a scissor-like, minimal but non-negligible fee for each transfer (per item or all at once) between characters. You quit your old character and want to move on to the new one? - Pay a relatively small sum and you can move your items over to your new main. You want to regularly switch the items between several characters which you play often? You're better off buying multiple sets rather than racking up transfer costs.