I can't argue against the insanity, but here's some other hammer prices on ASMs in 9.9 from this year:
#239 3,501 (ComicLink)
#275 1,351 (ComicLink)
#298 1,532 (ComicLink)
#300 6,101 (ComicLink)
#312 825 (eBay)
#319 1,226 (eBay)
#323 1,136 (eBay)
Well here is where the debate starts...
I paid $60 for a copy of Amazing Spider-man 303 in a 9.8 earlier this year. Is a 9.9 of that copy really worth about $800-1000 more?
If your book will lose the vast majority of its 'value' the second it's cracked out, then you've overpaid.
Sage advice.