I agree with that - and there were lots of time they mentioned not being able to buy annual passes for example, once they started doing regular parks vlogs, however - with the amount of shops on I-Drive and in Kissimmee... Orlando in general, that sell Disney merch - if you were a genuine Disney fan, I'm sure you would have picked up something from one of those to at least have something in your house - even if only a fridge magnet surely?!?
As I said, I think they accidentally stumbled into
YouTube phenomenon of Disney vlogging right when it exploded in popularity - and Tim developed his persona on camera and became a great vlogger... But I don't believe they were Disney fans beforehand - they didn't know character names for example (Woody's girlfriend because they didn't know her name was Jessie).