Heh, good analogy.
Good to know. I was a bit of a loss to explain the obvious to him, so I kinda gave up. (Gee, I installed new door hardware - being not someone who does this ever' day, I screwed up the first one, had to pull it out and re-install it, took more time and a little agita. My use of time was more than if I called my GC for a silly coupla door knobs, so it's not cost-effective huh? Yes, one should count one's own labor in driveway sealing if you do it that way, but to one's own value on time, not to what a paving machine brought on site can do! He's whacked.)
Banty