Once upon a time, following a civilized meeting over tea with some lovely young gentlemen, one of my fellow steampunks concluded that “A steampunk is someone who argues about what steampunk is.”
It often starts with peer pressure. All your friends are doing it, they talk about it all the time, they do it in front of you, and eventually they drop hints about you joining them. Maybe you're strong enough to resist, or maybe you're not - and you sign yourself up for an MMORPG.