People do more than 50 in ChipMixer (I'm not targeting any user here, using it as an example) and most of them are highly reputed members of the forum. Would you also call them as spammers?
The point here is
there is no minimum number of posts.
Still they do reach their max, and yeah, you didn't get my point here. We're talking specifically about the word "spam" here, let the things roll first and you guys have the power to tag the spammers as spammers once you see them spamming. Why to bother a campaign just because of their terms? Forgot about Yobit where people used to do more than 20 posts daily just to reach their max quota and did enough shitposts? 6-7 a day are still reachable and a person can make constructive posts if s/he gives around half an hour or more in order to create their content after proper understanding of the matter of a specific thread they post in.