This is what made me ask the question and ask your opinion about whether it is a new way of farming accounts or a way to do shilling so that the thread stays afloat and makes it look like it has a lot of activity so that other members can engage.
This doesn't look like account farming. The only way to build an account is to get merits regardless of the amount of activity you can spam up. It's more likely the latter, they're shilling the thread to keep it up, but there still looks to be no end goal in that as the op is not selling a product or service.
The only pointer to there being something strange is the rank of the accounts and that's not enough indictment, so I'll say the conversation is normal. Possibly the op has a community where he shares his posts and members there respond to it.