I don't know. but here's how I think of it-

if their main reason for entering my blog is to spread their spam remarks and they learn that action is blocked and they can't post their spam remarks it gives those that are not interested in anything else the "why both read them for nothing" type incentive.

so I figure spamming as their first intention or not if they keep coming back they must be getting some sort of benefits from it right. Otherwise they would not come back to my blog entries.

So I see the after that first initial come as spammer, cant spam but then they keep coming back as - that person no longer being a spammer but one of my normal readers that are interested in what I post about DID, my research and therapy plans and opions about what I have experiences and uncovered about this disorder ove rthe course of my treatment plan of 5 years going on 6 now.

In this instance I don't see spammers as once a spammer always a spammer. If they can't spread spam and keep coming back they are no longer considered spammers. They just want to learn like everyone else about DID and how to take care of it.