Found in many gaming groups, this concept is not unique to everything. Typically, the individual somehow manages to get the Dungeon Master/Game Master to let him/her go away while everybody else is doing something boring yet plot-oriented while the individual wanders into the forest to fight monsters for no apparent reason. Not good roleplaying. Naturally this kind of XP Whoring is only possible in such systems as D&D wherein XP is awarded explicitly for combat, not for being in-character or anything obviously unrelated to roleplaying like that.