Says Billy Joel most likely far richer than at least a typical front row seat buyer. Btw while I would consider myself a fan I'm not obsessed with Billy Joel and also he has certainly how do you say 'his issues' (ie addictions and so on).

Also who is to say because they don't act ridiculous or obsessed they aren't 'real' fans. What is a real fan anyway? I hadn't heard there was a universal accepted definition.