Good question Mark. I've been buying on eBay for 20 years, so I've seen a lot of changes and maybe I'm just old and grumpy. I think eBay ran off a bunch of collectors with all of their new rules and fees, so the buying pool is smaller and of lesser quality. There are also so many more flippers that there is more competition. That means prices are higher, which makes me less willing to take the risk to buy uncertified. Also, my tastes have changed, so the type of book I tend to want is going to be in different venues. Lastly, I have less free time to browse so it's hard to sift through all the junk.