I'm not sure how I feel about this suggestion but it seems worth pondering: If you have an advertising-supported site and advertising is what is supporting the community then it seems reasonable to show more or less advertising based on the contribution of individual members of the community.

The most valuable contributors would see little (or possibly no) advertising in exchange for the value they are contributing with their time. People who are disruptive have a cost and the compensation for that would be to gradually increase the level of advertising shown to them.

Clearly, this isn't perfect, but no system is and there is at least a rationale for it.