I would not ask him to look into alts because of merit abuse, I would ask him to look into alts because of evidence that one person with many accounts is making many low quality posts. The appearent merit abuse is simply how we know they are likely the same person.
The admins wont look into any alts for any sorts of abuses. People mass farming/botting should be looked into especially when they're ban evading but it's just not something they seem to be concerned with. It's this Laissez-faire attitude or lack of time to look into these sorts of things that is why the forum is such a shitshow and is only going to get worse. It's not going to be long before the only people who are posting here are farmers, bots and bounty hunters churning out their one liners if that hasn't happened already.
BadBear would often look into alts in connection with banning spammers such as those described in the OP, there are a couple of instances in which he banned spammers minutes after they bought (and paid for) accounts, which certainly should have discouraged spammers from buying accounts.
Occasionally he would. It was too much work for one person and probably why he just left due to burnout, but now nobody is doing it at all. Even accounts aren't being restored despite numerous people having more than sufficient proof and being verified by others.