

I mean I sort of agree, but I’ve both used custom engines and seen people trying use custom engines and you have this problem where the engine was designed for a game, rather than for any game. So if the original game didn’t have a particular feature the engine has no capacity to do that thing, so every time you want to make a new game in that engine, you basically have to rewrite the engine.
It works if you build an engine to be an engine, but as you say that’s extremely expensive and time consuming and you probably am not going to get any benefit out of it. You could try selling the engine, but you’re unlikely to make much progress unless there is a significant improvement over the other options already available.
2K can actually release a functional game though. The problem is they get greedy after the fact.