Hah, my suggestion to charge for sigs has taken hold subliminally! 

I did think there might possibly be some merit to charging a fee for posts that varied inversely with rank, but upon further consideration I now think this is unavoidably regressive/centralizing. Dedicated spammers/scammers will figure out a way to game any system so I am starting to warm up to the idea - which is not at all original - that such offenders be automatically temp-banned if, say, x different members mark any of offender's posts as "shitposts." A possible implementation would be to scan for keywords in a moderation report such as, shitpost, bot, spam, scam, off-topic., etc. Temp-banned users could appeal via a single thread in meta - same as now - which only non-bots would attempt. If the same user is auto-banned three times then make the ban permanent.