I think there is often expectation inflation if people spent a lot of time on high XP/lots of maxed out skills on a sheet games. People won't do ANYTHING that they don't know that they will almost always succeed at, they aren't satisfied without mega dice and anything else than the huge ass rolls they got used to on high XP WoD games makes them feel like they "aren't good at anything so why even bother".
Sometimes it takes awhile for people to realize that yes, they still get to take down the baddie along with everyone else even if they're not the top of the pack skill wise (and maybe it's kind of nice to not have people one shot everything), they can still do most of what they want (unless it's beat every other pc in the scene even if it's not PVP). Sometimes it also means when they do they're more willing to take other risks as well (thinking outside of the box/trying something creative rather than throwing up their hands and oocly saying that they can't contribute at all because none of the scene revolves around their two highest skills).
I do think there are def. people who always like to be on either side of the spectrum. And there's always some very naturally competitive people who can't help wanting to be "better than" everyone else in a scene.
I do think there's very often a great hunger for "specialness" on any game. I can only think of a few people I know out of years of gaming who don't crave that at least to SOME degree. I also think that's often the most lacking thing on most MUSHes, so people will go to the numbers because at least that can provide some of the feelings and it's within more of the player's control than waiting for someone to really notice them and incorporate them into story beyond what that player does themselves. So I don't think you can really blame people for seeking that avenue either, really.