What do you say, man? When there was the CM campaign there were a few who reached 50 posts per week of the best quality, and most of them wrote more than 20 per week with quality, so the data disproves this, and therefore your subsequent argumentation.

To me, in fact, 20 posts a week seems a low requirement and I tend (depending on weeks) to write closer to 30 even though I get paid for 20. Obviously they are not of overwhelming quality but the fact that I keep earning merit over and above my activity indicates that there is some quality to what I write.