Feels a lot like what happens with electronic music producers. There is a bunch of highly taltented sound designers out there, putting their hard work on BandCamp or whatever platform is friendly enough to make some bucks on. But almost nobody can make a living off selling releases. Almost everyone has to tour and play live gigs to make some money. And I guess the biggest reason why it is so hard to make money with releases is the same as with indie games, too many people trying to get a piece of the same cake... Paying fans are rare.