I think FOMO is just undiagnosed OCD combined with limited cash reserves and time boxing issues... I believe the Pokemon phenomenon of "Gotta catch them all" crossed with the Cabbage Patch dolls and Beanie Babies collector hype has conditioned a lot of people into believing that the mantra of "once they are gone, they are gone" is a hard and fast rule never to be broken. Its like my desire to own a specific thing can not be suppressed, bypassed, or dealt with in any other fashion than spending a ton of cash to ensure I get this one desirable "thing", and not you, or anybody else on this planet is gonna make me change my mind.