Yes, my brother is eccentric, but for him, it's all about attention seeking.
He's the guy who's always bought weird cars, i.e. either a normal car in extreme colour such as lime green, or just a "weird" car i.e. he once had one of those ridiculous looking "boxy" cars (I think it was a Fiat Multiplar) which he only bought because it looked stupid (he admitted that!).
He's had a lifetime of short-term hobbies/interests, usually based around attention seeking - he's never done anything "quiet" like fishing or stamp collecting. He's done amateur dramatics, being a DJ, organising events, firework displays - does it for a couple of years, gets bored and moves to something else.
He started getting interested in vintage vehicles, but of course, not a vintage Ford Anglia or Escort, it had to be attention seeking, so started with a military land rover ambulance, but didn't get enough attention, so moved onto a fire engine, still not enough attention, so now he's got a bloody great WW2 tank in his drive!