Though you cited a good example to support your call but I am not totally in agreement with you.
Not everyone with lots of post count without merit are 'shitposters', I guess you don't participate in Airdrops and bounties.
You have to report your weekly activities on the bounty thread so if you were to participate in 8 tweeter/Facebook campaign, that will be 8 unmeritable post in a week; let's say you also join Airdrop and you're required to post a Proof of Authentication on the thread.
I just want you to understand that people are on this forum for different reasons and recommending a ban for low merit/post ratio is unacceptable by me.
Only ban 'shitposters' aka spammers even if they have a thousand merit.