Hmm yes, some people do feel the need to pick on the "illiterate" members, which is a shame if they were just having fun roleplaying. However as a roleplayer, I consider myself to be in the literate category, and on occasion I do find myself getting a little frustrated with these other people because I simply can't understand them sometimes. On the whole I just RP with people I enjoy talking to, and their literacy level doesn't matter too much. But it's like wolfspeak really, the issue is not necessarily how well they can spell everything, it's whether I can understand their post. And with wolfspeak, I certainly can't. XD
As for the mapped vs. mapless part, I find it hilarious that some members consider mapless groups to automatically be illiterate and "nooby", as you put it. I've joined many a mapless group and found them to be at the pinnacle of literacy, especially compared to some mapped groups I've been in.
I like your last point too, literate and mapped roleplays completely avoid the problem of those pesky den claimers. Hmm, been a while since I joined one like that, actually...excuse me. O3O *poofs away to find one*