Some classes are so effective at soloing that it's a hard sell to get them to join a group and take an XP hit. For example: wizards, mages and especially pre-SOE necros (most OP'ed class in the game) have almost no incentive whatsoever to group, since they can quite easily solo their way to the top levels without any outside help. The same can be said for druids. Anybody who has watched a skilled wizzy or a druid quad-kiting in Cobalt Scar... getting four times the solo XP (and money) for roughly the same mana cost as they would expend on a single-mob pull... can easily understand why those classes might prefer to hunt solo. Just as you would understand after watching a pre-nerf necro (like my old main) soloing Lodizal in Iceclad.
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