If the spam control isn't brilliant, its probably loads each day. I suspect it is good..
But folk join forums to do some ODD stuff, I once found a user join a forum four times, four seperate accounts all on the same day, and then start discussions with themselves!
They were not a former user who was blocked, they hadn't got in a row and needed back up, they appeared to have joined purely to talk to themselves!
There are people who join forums for the attention and post dramatic threads carefully calculated to get the response they want, which seems like it would be support and 'ah yes you are right poor you' but frequently that ISN'T what they want, they want to be attacked left right and centre so they can feel justified in saying the world hates them (I assume!)...
Odd folk out there.
I remember a case where two people invented a third person on a facebook group they ran - five years down the line everyone, EVERYONE believed this third person existed until first one then the other person died and of course it finally came to light that person three had never existed!
Nothing malicious or nasty was ever done nor do I believe it was intended, in fact these two people were really really nice, generous, kind, funny, helpful, on social media AND in real life (I met them both!) yet.. for some unknown reason they created this third person and duped us all!
There's nowt so strange as folk.. and they're all on the interwebtubes!