Listeners don't get anything AFAIK. There is no incentive to load up a lot of MUSE. So the system naturally acts a lot similar to a one account one vote model. If you have more Vested MUSE artists get rewarded more when you listen their music. That's it. There won't be gaming the system like STEEM vote buying with the exception of buying a ton of MUSE and replaying your own song 24/7 . Since there are few artists and most people being just listeners nobody would really take this as an issue. It'd e like mining.