I did a search of the forums and found some very old threads (2005) but haven't seen it discussed much recently. And other PC forums appear to be dead or simply not there.

But there's some VERY interesting auctions ending today and this week for some of the rarest early DOS games out there. I'll update this thread after they complete so we can at least have 2011 sales points for reference. I've searched the forums and it's very hard to find any pricing data for many of the early 80's classics.

But on topic, Sierra Adventure games were some of the best ever. Really wish there was more of a market for them. Way better than many NES games that are 10x their price...