I'd say, probably not at this time. ^^ They're not really something with a hugely wide appeal, especially for original characters. So if anything, compile them for your own reference, but don't worry about trying to sell them. (I'm actually compiling some of my own references, and will be getting them printed up, but the likelihood that I'll sell them is pretty much nil. ^_^ )
Regarding the Otakon thing... Disney, Gaia, and Ragnarok are known companies to NOT do fanart/art/craft items from... I haven't heard anything anywhere about the others, though. But fanart is being progressively reduced in a lot of AAs, whether it be due to industry pressure, or due to the organizers wishing to get to a more "original" quality overall in the Alley.