So far, Hive has paid zero in fees across 19 outside and 2 inner ecosystem exchanges (this is pretty damn incredible, and all thanks to great liaisons). Currently, fees to be listed are not something that is holding us back with the big outstanding guys- in most cases, if the token is active (and here's the rub for us) a lot of work can be done to negotiate down fees if they do exist. We've seen successful proposals where someone pays up front or in part and is reimbursed by the DHF, or a multisig account, so you're entirely right- that absolutely could be done if we did run into a need for it!