[jtheory]

Slashdot experimenting for a while with letting high-karma users disable ads.

They didn't disable them by default -- they just started showing a checkbox in the sidebar providing the option as a thank-you for "your contributions to the site" or something like that.

I don't see the checkbox anymore (I never bothered to check it; I don't visit much nowadays), so perhaps they decided the experiment wasn't a success.