That's certainly not reality.
I think your gripe is that that Halloween party costs "40 bucks", but that's certainly not a charge just to see Roger. The party is so much more than that, and Roger just happened to be something they brought out for fun.
It almost encourages Disney NOT to ever bring out any fun surprises because of gripes like yours. Much easier for them not to ever do anything fun or spontaneous so they don't have to listen to "pay 40 bucks to see a character" from you.