Back to the original auction...I don't think that $100 is too much. If someone can paint on a "professional" level, they should be payed for it. As a pro, you should never work for less that $15-20 an hour. I'm sure that more than 5 hours work went into these things.
I am uaually shocked at how cheap most customs are. 11.00? The figure cost you five, plus paint, plus time. You're losing money that way.