did you enjoy your 10 hour lines in boston?
also, anime cons are full of cosplayers. I wouldn't call them hardcore though. Sure, maybe they put some amount of effort into that costume, but they're all still dressed as one of the following: bleach, naruto, kingdom hearts, final fantasy + 1 or 2 "flash-in-the-pan" anime of the times such as trigun, hellsing, fullmetal alchemist. They're popfags as far as their anime choices go, and I don't count that as hardcore.