Not All bounty tokens can be sold, Because you can Trade them by Contract address in the Decentralized Exchanges like Etheredelta, Forkdelta, and the similar, It is not Recommended, we will Never forget to get Listed On them.
Not all tokens can be sold. Due to the huge number of tokens on the market, exchanges try to beware of shitcoin and therefore make more stringent rules for going to the exchange and many tokens, even successful ones, do not pass them.