Trading Black Market Guns for Coupons

I know that some people get bothered when they buy a bunch of crates and win the same gun 2 or 3 times. And they only need the one.
So i thought they should be able to sell the extra guns for about 7-10 coupons.

So say i win the the M4A1 custom 3 times, and i sell both of them for 20 coupons.

or ?

If this has been suggested b4, im sry, i stopped paying attention to the suggestions section a while ago.