I will also say that while I admire Consumers' Union's policy of refusing all outside advertising in Consumer Reports, refusing free samples, and operating on a shoestring budget, in order to avoid even the appearance of a conflict of interest, they are in an unusual situation.
The only time I have ever resigned my membership in an organization was because the organization (namely the American Guild of Organists) had a policy of shamelessly running untagged paid advertorials as the cover feature "articles" in their membership magazine, and refusing to recognize that (even though they demand that their members agree, in writing, to uphold a code of conduct) they were failing to uphold the ethical standards (i.e., keeping "editorial" and "advertising" at arms length) that most other magazines, commercial or membership, uphold as a matter of course. (The technical term is "payola.")
By contrast, about the time I joined the National Model Railroad Association, they were just starting to accept paid ads in their membership magazines. There was a lot of debate among NMRA members, and a lot of talk about "slippery slopes," but I, for one, applauded their decision (it paved the way for pictorial covers, then color covers, then color throughout the magazine, and they did not have to sell their souls to do it!)