Good Opt-Out Language
OptMD.com serves a LOT of the popunder ads you may see on a variety of sites. Their website allows you to opt out of receiving their pops, which is laudable given the way many popunders have no regard for the wishes of users (even though, they still work for a lot of advertisers). What I found interesting on their opt-out page was the following language beneath:
WARNING: by choosing to opt out you are taking an active position not to support the publishers whose websites you visit and whose content you consume free of charge. In doing so you threaten the long term viability of their operations.