You can't be serious. A quality fret level and dress costs more than that. If anyone if doing refrets at that price, do not go to them under any circumstances; they will **** up your guitar something fierce.
The idea of a 1971 Strat with a refret being worth $15,000 is completely ridiculous to me. Guitars of that era and quality were the reason that the old ones started becoming valuable in the first place. They are not good or desirable guitars. A truly N.O.S.-quality one, i.e. a true closet classic, might bring that from a really weird collector, just as a museum piece, but good player examples of these guitars are highly unlikely to break even a quarter of that. Beaters to decent ones can be found for 1–2 grand.