Quantity =/= quality is a weak argument in my eyes because;

[list][*] Quality in writing is subjective - this makes this a cop out answer. A lot of roleplaying writers, here and elsewhere, think their writing is god-tier awesome when really it's shit tier quality fanfic selfservice.
[*] Quantity is not inherently linked with quality but more often than not qualitatively great posts have a larger quantity of information (and therefore, higher quantity of words) than low quality post -- there is certainly a link between the two.
[*] Writing is not about quality, writing is not about quantity, writing is about how much you enjoy writing the post, and [i]roleplaying[/i] is about how much you enjoy writing the post [i]and how much others enjoy reading your post.[/i] If you are content reading one liners until 5 am in the morning then I'd say that the roleplay hits the perfect spot for you. Personally I can't do that because it doesn't interest me. It's not a quality I look for in a roleplay.
[*] Subjective and personal take that come from my own experience (i.e. anecdotes) but the people who put [b]QUALITY IS NOT QUANTITY REEE[/b] at the top of their interest check are also often the same people who write a small paragraph that parrots exactly what your post said without adding anything new to it. Quality =/= quantity, sure, but your post has neither. I'd rather read purple prose than a rehash of what I already wrote for you.[/list]