I was the buyer of that book. :-) Yes, it was a strong price, but I have been waiting 6 months to find a decent low grade example at auction, and prices have just been through the roof. The last few sales 1.8 sold for $3600 recently....
http://www.ebay.com/itm/Incredible-Hulk-1962-1999-1st-Series-1-CGC-1-8-1156876004-/310757348240?pt=US_Comic_Books&hash=item485a94d390
and a 2.5 went for $4000 on C-Link
http://www.comiclink.com/itemdetail.asp?back=%2Fsearch%2Easp%3Fwhere%3Dsell%26title%3Dincredible%2Bhulk%2B1%26ItemType%3DCB%26x%3D0%26y%3D0&id=973801