OK, the reissue listed for 75$ sold for 168$ in the end. Stiff, but that's what is paid for them obviously. Now, if I'm VERY optimistic, a mint first release may bring twice the amount, provided you indeed find a collector of Tamiya 1/12 kits, which may be tough outside Japan.
7500$? Either these guys know something all of us don't know, or it's the kind of optimism of the man thinking his wife gave up smoking cigarettes when he starts finding cigar butts around the house.