"
 Very good point, actually. Often long-time impostors, regardless of their motives, intend to remain in their assumed role at least until somebody reveals the ruse. Those who assume some other role temporarily for fraud (like Wilhelm Voigt) or for the hoax of exposure (like Joey Skaggs) or for investigative journalism are bit more problematic cases. In effect they are ""temporary impostors"" but the difference is hard to define. What do you think, could it be useful to include a section about using sort-of-an imposture for some specific purpose? -  "