Before Ebay became a household word, I made a small fortune selling hard to find and out of print books on Ebay. Most were sold to dealers who had clients that wanted the books. I never paid over a few dollars if that much for them at yard sales and thrift stores. Now most know to check Ebay before selling. You have to strike while the iron is hot as they say to make a living selling collectibles. People with disposable income don't blink spending few thousand dollars for items they want, worth the price or not.