I'm working on a really low grade T3 set, so I'm not too in touch with the prices of cards in the condition of yours. I did some searching around to see if I could help you out with pricing. There's definitely something funky going on with the Doolin card. Compare these two auctions:
REA,
Mastro
There are so many variables that can influence the price (name spelling, back type, deviant bidding, who happens to want one, general world economic conditions, etc) that I can't tell you what's what. Maybe someone more experienced will chime in. I know I don't pay a premium for ad backs, but I'm a
cheapskate poverty-stricken college student.
There's also
this lot of 10, most of which I'd say are comparable to your lot, only that yours probably has better cards and there are more of them. You might be getting gypped at even $15k.