If we take this at face value, she could have asked more nicely, and he could also have followed the "F you, pay me" principle, and just quoted her a figure.
Had he said, "I'd be happy to make you a poster for your cat. I will be able to do it with an hour's work, for which I will bill you $80", he would not have wasted her time, and she could have made something herself in her word processor. (Or, she'd have said, "Awesome, here's eighty bucks".)
> Q: Are your articles (like Missing Missy), real emails?
> A: The email articles are verbatim ...
Even if his pieces are meant to be satire, IMO it's not particularly good satire. To each his own, I guess.
[1] http://live.washingtonpost.com/david-thorne-internet-is-a-pl...
(Not that I really care to know; this is getting way off-topic.)