this might be a bit off-topic, but I was just wondering how easy it is to "forget" rules and play the game wrong especially if you play solo. Player that are eager to play might just read the rules and start playing. Without double checking later on (e.g. because everything goes smoothly) there might some things be forgotten, e.g. resource matching or shadow cards, as in solo-play there is no one to remind you of the rules you forget. Thus, the game might turn out to be fairly easy for some players, resulting in a quick loss of interest. And that would be real shame....since I personally like the game a lot, despite the luck factor and its difficulty.
So even if ffg sells a lot of core sets...I wonder if there is a substantial number of players that put the game in the shelf to be covered in dust. I don't even say that forgeting rules is very bad, on the contraire, I can see how it is fairly obvious to forget about some of the stuff and I think it might be a real threat to the overall success of the game concept.