As a moderator of computer security forums (cryptography specifically) who deal with both cranks and aggressive spammers - you just can't do without bans.
The only long term solution is to ensure there's always more than one community with separate leadership, so there's accountability for mods through pressure from the users. The threat to leave must feel credible.
Beroende på hur avtalen ser ut så kan det vara så att fasta månadsavgiften per kund mot hyresvärden står för större delen av utgiften, och att skillnaden i pris för snabbare abonnemang är ännu mindre med volymavtal.