1. I said best selling game, not series.
2. From The Bottom Feeder, March 17, 2009:
Originally Posted By: Jeff Vogel
The original Geneforge, for example, has sold jillions of copies, though we got far less cash for most of those.
I have seen Geneforge 1 on many, many online gaming sites-RealArcade, WildTanget, and HP games, for example. I have never seen an Avernum game there. Sure, they only sell for like $10, but you have to figure that they have raked in a large amount of sales, as a loss leader to get gamers hooked. In fact, that was the way I got introduced to the game in the first place- 5 years ago. I would imagine that it's still going strong.