Un-flippin' beleivable. Ours has definitely become a much more expensive hobby than it used to be. In the 1980's you probably could have picked up that 2-page spread, or any other pages from X-MEN 137, for in the neighborhood of $100 a page or less.

I remember when guys were offering me early 70's DC Kirby pages for 15 to 25 per page, and that was in 1987. When I was at a show in 2012 looking at similar 70's Kirby Marvel and DC original pages, they were in the $2,000 range per page.