They seem to have done a lot of colored sketch cards for the regular release, and that on top of the over-saturation of sketch cards in general with all series have dropped the prices considerably.
That nice Dustin Graham colored sketch that Dustin posted as an example was mine, and it only sold for 20 bucks! The problem is that these results were seeing now are also affecting the value of the sketches done in the past. I'm glad I decided a while back not to pay crazy prices for colored sketches and stick to B&W's, but even the value of B&W's have taken a serious hit.
That is sad. That would probably have been one of my auctions as well. I don't collect sketches for future value although it would be nice to know there will be a future value. I just got home from a biz trip and got in 4 packages all with sketches. I paid a hell of a lot more than $20 each for them but these are the ones I want for my own collection. They may never be worth anything. Also, keep in mind that few of the big sketch collectors don't care about PC or ANS characters. They want OS stuff.
I see so many sketches on ebay with $200+ BIN and they are still there after months. I actually love it and I hope the current trend continues because if there is something you really like you will be able to get it for a good price. The caveat is when I have to sell a sketch I don't want it to sell cheap. It's a total catch 22.
Remember people, it's also July and not too many people are sitting around watching ebay. Its summer. You are better off waiting a bit to auction stuff.