Speaking strictly about Nigerian local board, their merit/post ratio is among the lower ones among all other local boards so no, I don't think that anything weird is going on there (at leats not on the mass scale). Having said that, they are one of the biggest local boards with many active members which may give you impression that something dodgy is going on.
I'm not saying your statistic is wrong, but it's not accurate in this context.
It's true the merit/post ratio in the local board is low, but they're actually share their merit in global board...
If you look at any mediocre to average quality Nigerian poster’s merit history you will often see a wall of merits mostly coming from users such as fillipone, JayJuanGee, and CryptoBrainboss.
Umm, I think it's too far.
They're merit sources, so they have more spendable merits unlike ordinary users and sometime merit sources are used to support their local boards, even though there's no written rule about that.
fillippone, he has it's own
Merit distribution thread, actually any user has a same chance to report his post for being reviewed and merited.
JayJuanGee, I would say you're wrong, he's one of objective merit sources that don't care who you're.
CryptopreneurBrainboss, he's the merit source in Nigeria, so it's make sense he spend more merit in his local board.
What I see the problem is the non merit source users, not the merit sources.