1.) You say it means greater length, but then why are there threads with a paragraph minimum (casual) and others with two (advanced) and others with three (custom)? You say it means higher quality, but how do you define this quality and more importantly; how do you measure it? Give me actual quantifiers. As is, you are unable to present me with a proper way to define what seperates 'high-casual' from casual and/or advanced. In my experience, the definition of 'High casual' seems to be up to the interpretation of whoever uses it. Hell, I've been in both casual and 'high-casual' RP's a plenty and I can get by just fine writing the exact same posts. I've found it rare to be in a casual RP that doesn't have a majority of it's posts long enough to be in advanced. As a classification, 'high-casual' doesn't mean anything to me.
2.) The floor of advanced is recorded as 2 paragraphs minimum with good spelling and post significance. That's not an opinion.
3.) 'High casual' isn't between casual and advanced. It either adheres the standards for casual, or to those for advanced. Just in the casual section. There is no such thing as a 1.5 paragraph. I mean hell the only inbetweens I can think of are "1 paragraph, perfect grammer" or "2 paragraphs, good grammar." And I'm pretty sure you mean neither of those. 

You can villify my post as attempting to mute and then brainwash the masses. However note that I never said you can't mark your game as 'high-casual' and I never said you can't request X standards in Y section (in fact I explicitly mentioned you can.) I just say that it's a meaningless, redundant term and am giving you my reasons why. Which is more because you challenged my post, rather than tryng to mute anyone. 

I don't think I have much left to say much besides repeating myself. Oh well.