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Shitposters will move around, and try to do anything they are capable of (making funny posts, pseudo-good posts) to earn a single merit to become Junior Members. They will try to do this (with their low-quality posts) as their 'efforts' to earn extra money with Junior Member rank if they fortunately make someone laugh and send them a single merit.
I don't think anyone is hunting for merit in the Off-topic section. Almost nobody with good reputation is checking the section regularly. The majority of those posting there are for to gain activity and to spam posts for their signatures campaigns.
Of course there are good discussions there and I've seen regular members posing like OgNasty and Vod.
I don't think any of those shitposters will move to the main sections to shitpost, it won't take long before they get banned.