Sgt_Kickaxe - 9:43 pm on Sep 9, 2012 (gmt 0)
Text readers represent 0.000018% of my traffic and the pages requested were non-existant. Does anyone even use a text reader anymore with built in browser zoom features? I suppose you need good vision to enjoy my particular niche but still...
From a search perspective you do not need a sitemap on an established site. I do find them helpful on a new site or when I need to make several url changes and want to include new and old destinations on the sitemap until Google makes the transition in their serps. A sitemap is a tool for talking to a robot and the robots are plenty smart enough these days.
They can't hurt unless they are created in dynamic fashion or by a plugin in which case they do draw resources and might merit removal.