I think there is no perfect solution for your problem for now as even if you could report most of them they can just create more bunch of them with just some codes and clicks.
Even if the mods or admins permanently banned the IPs, it's pretty much easy for them to switch to a new one and again continue their work of shilling the threads. For now, we could just hope that there would be some restrictions for newbies to post in some threads as even if we have banned them from ranking up still they can comment in any thread and build up any type of scams to earn attention.

My suggestion to the admins would be limiting the thread bump to at least a jr.member level account ( Thread will move up word in the list only if a jr.member and higher rank comments on it). I think this is the best solution to solve this problem of irritating BOTs.