newt people don't care about the engine as long as the game is good. I believe it's unhealthy to compare yourself to asset flippers when you're a honest and descent developer. These people have no moral compass, and make **** games anyway. So I believe the best course for us devs is never to thing about them.
I'm saying this fact lowers the marketability to a point that it may not even be profitable on Steam.
Given the overhead of just getting it listed it pretty much guarantees that.
It's a niche item in a an untested market.
It's like selling ink at a newspaper stand.