I'm struggling to find a use case where entertainment and "profitable market place" don't collide therefore turning it into work.

Once there is real value on the table won't its extraction be optimized as hell by a small group of determined "entrepreneurs".

It seems that my (casual Gamer) position will always quickly turn into "customer" in this case. Then it's just a plain old microtransaction (for varying sizes of micro) game.

Many people enjoy those (weirdly enough) but once again blockchain adds little.