Nearly any social circle or community that coalesces around an identity banner is susceptible to the idea of "wannabes" -- these are people who are attracted to the label due to a desire for belonging-ness or a romanticism that the banner is somehow better-than-being-normal.

Occasionally it's the other way around -- depressed individuals seeking some negative label or stereotype so that they can further lament their unstable or undesirable condition. "Misery loves company."

The above types "wannabe" and believe they are. It's hard to detect wannabes...they can become enmeshed in the community and be quite active, or perhaps they eventually figure out that they were wrong and leave -- the realization is probably due to some type of disillusionment. The flipside of that is that it's possible the be and talk yourself into believing you are not

There is also some measure of fan-culture around some mythological archetypes -- such as Elves in the wake of the Lord of the Rings movies, Vampires after Buffy:TVS and so on. Due to the prevalence of these archetypes in popular media, the community does attract some people who "Wanna be" elves, vampires, etc. even though they know that they aren't. Some of them hang out for a while before realizing that we're by far an unromantic and rather boring community as a whole. They also probably leave disillusioned.