I think 300k is far higher than reality.
If you look at unique authors in the last 7 days it is typically around 15K-21K (many I assume are bots) and you look at the last 30 days you have around 50K-69K users, many of which are of course automated posts.
Ditto, This is just what the code gave me. I also believe that half of those unique authors are just shit-posting. That's why I'm putting in place a system for the bot which takes everything into account including author's rep, post count...