eBay item 2254411960 (Ends Jul-11-04 08:59:59 PDT) - Batman 1 Spring 1940 CGC 1.5 Detective Comics
Other than the spine and centerfold, this comic appears to be structurally sound with good paper quality.
If I had 5 grand to spare, I'd buy this and have it in a professional restorer's hands in no time. It just needs a good press, cleaning and some mending... 99% of the book would still be original parts. I'm sure it would restore to Fine 6.0 or better with moderate (or less) pro work.
Perhaps if I skipped a few mortgage payments...