I have mixed feelings about this. Although I don't appreciate the "merit shopping", I understand his frustration too. He's not a total spammer, his posts (if I ignore the many social media links) are quite decent, and I don't think he's one of the spammers for which the Merit system was introduced.
He's also not making a secret about it. He could have moved his threads without anyone ever noticing why he did it.

Update for the sake of argument while playing Devil's advocate: what if I move a thread from altcoin discussion to another board, not to earn merit, but because my thread quickly disappeared due to the massive spam on the altcoin board? I would like to have more readers and responses, so moving the thread would make sense if it also fits another board.
Would that be frowned upon as much as moving a thread to earn more merit?