You still think that spam will only be reduced if paid signatures are banned ?
It may introduce many other complications / effects but for the SPAM, i think it will be completely eliminated.
I guess you haven't seen
patrol yet: almost all Newbie posts are only spamming links to Facebook and Twitter. Barely any of these posts are worth reading, and they can't even wear a signature yet.
Well, these newbies posts are also for the promotion of the altcoins and ICO and they are getting paid for it in terms of shit coins.

I think the better way to collect these reports is that they submit them in excel file as posting the links on thread and then counting them is a tiresome job.