I always suspected that people could make money from tickets, but I remember @GrandOldTeam pretty much dispelling that myth apart from the top games.But people who sell through stub can ask for ridiculous prices ( given the game of course)
I know some lad I work with who obly goes Saturday games because he plays footy on a Sunday he sells his Sunday tickets on stubhub and asks for like £100 per ticket ( the big games derby etc alway sell for that price as well ) which is daft
For less significant games, which people are more likely to choose to miss, then you'll regularly find unsold tickets on StubHub. Perhaps if the club helped with that?
It would be in the best interest for the fan and the club if that seat was filled, so supporting that could be beneficial.