If you guys check out the February issue of Robb Report's Collection magazine, you'll find a good article showing the founder of Heritage Auctions comic art. Robb Report Collection has published a bunch of articles in the past on comic books and art. Mainly because of the increase in prices I believe. This collection must be amazing in person. Artwork by Frank Frazetta, Wally Wood, and many others. Astonishingly, he says only 1% is on display! Also, he dropped that Steven Spielberg owns the Mad #1 cover art. You can read the article online too.
http://www.robbreportcollection.com/ - Go to the area on the right and page 58.