Supply-Demand folks, I guess if enough people do not sign up for their events, then it will adjust. However, I have a feeling that demand is way out striping supply, so they will likely be just fine.
I have no issue with Gen Con making a profit, if indeed it does. It has not always been that way and if a convention is not profitable, then it will go away. I think we can all agree that we do not want that.
I do think that a 50% year over year increase is steep, however, I do not know their costs. Those of us who run games have expenses associated with those events and the base fee of $2 per 2 hours is just for Gen Con. I think that the players just need to decide if it is worth the cost.