Note here that I'm not against certain kinds of advertising, and I'm all for subscription models and donation incentives and a great many other ways to fund sites. But third party advertising networks have forever lost my trust, and I simply won't tolerate the security risk nor the annoyance any longer. Your site is welcome to require me to disable AdBlock, and that's fine. I don't need to read your posts that badly anyway.
The "something shady" is AdBlock muscling their way into the ad revenue game using you as a way to bludgeon the sites serving the ads. Under no circumstance should an ad blocker prevent the site from working as expected; that's the purview of the site itself.
Have you thought about handling the advertising yourself and hand picking products and services that are directly applicable to your users and displaying them in an unobtrusive manner?
And as a side note: I consider ads from any ad network to be a security risk and while I respect sites for "politely" asking me to whitelist them I feel it's a misguided approach.
The other reason is it's a community, and the more people we have on the site, the better it is for the site as a whole; more people communicating and interacting with each other, which ideally brings more people and keeps the ones that currently visit.