Coupons for GP

Hello z8
i suggest to make coupons able to be bought by gp
because all everythink u can win in a crate u can buy with gp in the item shop
why not the coupons too?
i would like them for 2000-5000 per coupon
that would be fair and a player who saved all his money ( he has 120k then)
can buy up to 60 coupons and he can get a weapon by this!

discuss!

EDIT: And if not GP then at least ZP ( 2k-10K ZP per coupon)