To [@SleepingSilence]'s point, there is such a thing as purple prose, where a lot gets written and nothing accomplished. That can be as annoying to read as rapid fire. 

Free isn't my cup of tea either, but there's no reason to insult those who enjoy it. Same for Advanced: not all the people there are elitist snobs.

I think one issue with splitting the sections into these three categories is that many RPs end up somewhere between the delineation. I have seen several "high-casual" RPs. These typically are the same as Advanced, just more accessible (I'm sure people would disagree). My point is that there is a huge difference betwern rapid fire posting and 10 paragraphs per post, and most of that gets tossed into Casual.