to be honest, the solution for the pot problem is quite easy.
all they have to do is make the box price 60 silvervines instead of 6, and if they are worried they will become useless in the shop (for people paying KP), they can make a version that is directly bought with kafra shop at the same price of 30 sylvervines. the idea is to make them an option that is not abusable and yet keep it as a good option for people willing to pay (and thus support the server).
i dont think this have to be removed, but atleast make the prices the same as npc whites, that way you dont kill ingame stuff with cash shop stuff that can be abused via non paid ways.
just remember, if you want a healthy server, the kafra shop stuff MUST BE always the second best option. not the best, so that it gives the buyer an objetive to strive for with the new gear, and not the third, so that it warrants to be bought so that you get into competitive asap.