Poker Is this frowned upon?

Say you have a significant amount on your online account and last time you cashed out the check was sent 2 u, but ur bank basically took the check processed and won't give you any of the money from said check... Since this happened you have no trust in cashing out again just to get stuck for the money by your bank.. So instead of cashing out you simply want to sell the money off your account at a discounted rate say 90c on the dollar or possibly 80c... Is this tactic allowed?

Source.