It's not a cost-benefit calculation. You just do it because you do it and you wouldn't be you if you didn't.

Hard to put in words. And yes, you will feel like "WTF why did I do this" at times. A lot of people have parents who will remind them that they could have had an easy life instead. I try not say that even though I think it too.

I could sell you some fluff about being part of a continuity or the reward it brings, but it's post hoc rationalisation.