Was thinking on this a bit more. I think this is a very good marketing scheme. I'm an old-school rpger and I particularly prefer party based games. There obviously is not that much new that meets that criteria, and older graphics quality doesn't bother me. To that end, I've been buying a lot of games I missed off GOG. That said, there is a finite quantity there.
I've held off on buying any of Spiderwebs games though because 1) I had stuff I still wanted on GOG and 2) I just thought his prices were way too high (I know he's had some sales recently, but this was before that). To be honest, I'm not sure right at this point I would have bought Avadon at $9.99 (I'm talking PC). Not because I don't think it is probably worth it, but just haven't had much time to play games.
But being in the Android Humble Bundle changed that. For one thing, I've been looking for some games to add to my Android phone (Chess and Blackjack have run their course for me), as has my wife. Well of the 4 games you got in that for phones, 2 appeal to me, 2 to my wife. Throw in Avadon and it was a no brainer to buy (I paid $15 for the whole thing).
Now I have Avadon, so I'm probably going to play it, rather than indefinitely delaying trying it out. If I really like it, I almost definitely will end up picking up a lot more of his older titles.