Or you just made at least a half dozen people more anxious for the next copy that may or may not roll around in another 3-4 years.
Seriously though, the book's dearth of sales in 9.8 (around and otherwise) is obviously a reflection of its rarity. Look at Batman 608RRP for another example: there are 64, 9.8 slabs out there. Yet only 1-2 copies have come up for sale publicly going on four years now.
There are 14, 9.8 slabs of ASM 667, with the last sale nearly four years ago, and only 7 total sales of any slab type in five and a half years. Most sales of all comics are done privately anyway , and I would be surprised if we ever saw a 9.8 copy of ASM 667 auctioned publicly for a very, very long time, if ever.
Furthermore, the $2100sale of the raw VF copy a year and a half ago, and the 9.6 copy that sold for $4k seven months ago easily support your price. Hell, you might have still been too cheap.
-J.