Opinions...
Us Car Tool is very reputable, in perspective if you have a rare, valuable Mopar, that is a total rustbucket, its actually a good price. That basically works out to be less than 200 man hours of labor. Have you priced the cost of having a quarter replaced? Try about $1200. Add in a ton of rust repair, then the cost of a lot of replacement metal, then $15K aint bad.
Is it worth it for a 73 318 Dart, no, but what if you have a 67 383 4spd Dart that was tuned by Mr. Norm? Might be. You also have to remember that any restoration you farm out will cost three times as much as doing it yourself, labor kills you. I think if you have a 70 440-6 Cuda, then $15K is a deal.
Its obviously a matter of perspective, since I could never afford to pay for it, I would have to do it myself.