Heh... that's 15 years ago.
I figured it'd cost me at least that much to have somebody come in to do it so that's what I offered him. Any job like that I also consider what I'd want to be paid. We've never been ones to force big jobs like that on him unless I was doing it with him (he was up there with me for free initially) or we're willing to compensate him.
We're not talking about a foot of snow here... at one point I was literally up to my waist, so with a 30" inseam, we're talking 3' of snow....