You might need a few less extreme options on that poll. I don't like numbers in names because when I'm on a site that has regular personalities such as this one, I find that it's a lot harder to put think of those people as a personality. I suppose it's the way it breaks the flow of the name. Vocally pronouncing something like, and I mean no offence to them by saying this, "megaman24681012" just doesn't really work.
It lacks the feel of an actual name and there's a weird, almost indescribable subconscious feeling of wrongness because of it.
In the same way, people who use just words, names or a title as their name I find easier to relate to.
I guess it's about the feeling of person to person interaction, but now I'm just digging too deep into psychological territory.