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I don't know whether to send him a PM for his consideration.
If there's no rule about maximum posts per day, it's mean the user is free to create how many posts per day, this will depends on him to count it or not.
In the end I sent him the PM just to let him know the facts. It is true that Zilon strictly speaking did not break the rules of his signature campaign but I believe it was reasonable to bring the facts to the attention of his manager.
I think this might just be a wee bit off-topic,
I don't think it is (a bit) off-topic.
but I took a look at Zilon's recent posts and they're not only quite numerous but most of them are generic crap that I see a lot when I'm doing post history reviews. Nobody can read minds, but I think it's pretty obvious when someone is posting just to get paid.
I wanted to emphasize the "just" because actually getting paid to write works as an incentive for those of us who wear paid signatures, but there is a considerable difference with those who write
just for the money, than those who consider the money an extra for doing an activity they like.
Regarding the quality I had not commented anything but I also think that his posts are quite generic, although in a campaign where half of the 20 required posts are required in the Gambling Section that style of writing is usual.