How’s this for a cool policy: Coudal won’t accept advertisements on their site unless they’ve paid for and used the product first. Here’s what they say:
We are customers of all of our advertisers. We won’t take an ad unless we’ve paid for and used the product or service.
I wonder what they’re using to automate the process of running those ads? Jim?
That is truly the perfect advertisement, one in which you've actually tried the product instead of what would otherwise be a fluffy description.
Kudos to the Coudal people, they understand the true model of advertising.
I agree that from the perspective of trust, this is a great idea, but it sounds more like implicit endorsement rather than advertising per se. I'm not sure that advertising has any real call to trustworthiness in itself - it's just about publicising/notifying - it's the brand itself which carries the trust.
Anyway, this sounds like a great strategy for a site which carries a very few adverts (which do not change frequently), which targets a very specific niche market, and is a site where users come for "trustworthy" advice already.
I think endorsements (as suggested by Mark T. above) work much better than generic advertisements. I believe its one very good way of adding one more layer of credibility to the user experience.