Precisely, and there is a lot of interplay between the different levels.  

Hence the whole "High Casual" and "Elite High Casual Mk. III" jokes.  A lot of folks who can write at an "Advanced" level but prefer to stay in Casual or Free because the lower standards generate lower stress and therefore have a lot more participants.

Being an Advanced writer is great, but if you only put together a post a few times a year you may be more Advanced but are you as much a writer as someone who posts in Casual or Free on a weekly basis?  And what does it really matter.