No, fuck that. Paying a game engine ~~for~~ based on the success of my product is asinine. Absurd.
That's like car companies asking Uber drivers for a cut of their revenues.
Or knife companies asking restaurants for a cut (heh) of their revenues too.
It's sheer, sheer greed and nothing more.
Edit: I didn't convey well what I meant. Yes, of course you should pay for a commercial game engine. That's not asinine. I meant to say that it should be a flat fee, or maybe a tiered fee. But not something proportional to the amount of downloads.
Sure, but per download, and retroactively? Absurd.
I like Reaper's business model better. Yes, it's audio, and yes it's simpler, but it makes more sense. "You poor? Pay USD 60. Pay us USD 240 for the next upgrade when you make it big." Imagine if they said "pay us 0.10 per download." It would be total bullshit.
I don't follow the Uber driver having paid for their cars. Yes, yes they have. Just like game studios paid for the offices, hardware and human resources.