RenderWare was quite a special case that made trust in third party engines go down significantly since EA closed it to external customers just as the PS3 hit (Renderware kind-of saved the PS2 since it was "complicated" in the same ways as the PS3 but having a middleware enabled many smaller developers to focus on their games).

Engines has been (And is to a large extent) bad business because unless you really do something _really special_ it's way expensive for little gains (especially if you're targeting realistic games since there is so much to focus on before even considering portability).

And I say this as someone who started out working on custom engines (but am out of the business outside of hobby stuff).