If we put Evilness to the IP based on deleted posts by mods I think big part of those bots, which posts get deleted often can be reduced a lot.
I think it will be a useful feature to show the "deleted posts count" in the users profiles because this statistic on bpip.org is not correct. It happens that dozens of messages have been deleted but the data on bpip.org doesn't change.
Bounty managers could also take into account the parameter of deleted messages when they are recruiting people to signature campaigns. Possibly this will encourage bounty hunters to write meaningful posts and don't break the rules otherwise they risk being in the "blacklist".