When do you have enough of an unfinishable game?

[VGPolyglot]

JEMC said:

VGPolyglot said:
I generally don't buy unfinishable games myself, I prefer ones that have an ending.

Wait, you don't play racing, strategy or simulator games?

Racing games have a set amount of courses, don't they? And don't strategy games have a certain number of missions, too? I don't play much of them to know.