Spammers spam because they have some sort of incentive, whatever it is. It's a fight against windmills...
The incentive is not only signature campaigns, Some users hope to benefit from spanning by giving activity some users hope to benefit from spamming by gaining activity on their accounts.
4. Repeated posting :
This was one of the shockers I saw the first week I joined the forum. I read where a user posted a particular text and in few time later, he will post that same text in another thread and keep posting thesame text. This should be the apex of spamming and this type of posts should be reported.
In terms of repeated posts, sometimes it is not like the user posts a particular text on different threads, but on a particular thread, a user may decide to rephrase another statement that has been made by another user earlier before them in the form of repetition. You can notice this in some mega threads in the gambling section where one thing is said in many different ways.