Because you changing your name is annoying.
Wouldn't say expert... just experienced with high expectations. I've played RPs that are really literate, with each post spanning several paragraphs. Most of my introductory posts are around 10 pages long on microsoft word. If I'm going to be putting a lot of effort into my posts, I expect people to do the same thing.
If I go into this RP and write 4-5 paragraph posts and get responses that are only two sentences long, I'm going to lose interest REALLY quick.