I think a certain amount of satisfaction would come from making things fit and look good still and from doing things cheaper than what might be possible otherwise. I guess it's like anything we do in life; If we do it well, to the best of our ability, then it becomes more satisfying.

Not the same but...I've recently taken over the care of my front lawn from a gardener. He was cutting corners and it had started to look worse over the years. Besides, it was costing my $40 every three weeks. So, I took over and in only 4 weeks it's improved 100%...It's starting to fill in where his heavy ride-on was killing the grass and the edges are looking better, rather than him shaving them all down so far he doesn't need to actually edge them each time.

It's left me a little satisfied and whilst it's more work for me, the reason he was doing it in the first place, I don't mind. I guess you'd get that same sort of thing when working on your bikes.