Ask HN: How to explain value of co-op in one line?

I am a huge fan of cooperatives, and I think the Internet opens up some unique opportunities for cooperative ventures. Over the years, I've thought up a handful of web-based cooperative business ideas -- such as a web hosting company, or an Amazon alternative -- but I have always failed at coming up with a one-line "here's the value of a co-op" marketing pitch that would immediately resonate with a visitor to the site. I'd love to hear suggestions from people about how to concisely communicate this value to people. Just to give you a little Cooperative 101: Unlike nonprofits, cooperatives do exist to make a profit. But unlike regular companies, they are 100-percent owned by their members, not outside investors. With consumer cooperatives, the members are the people who buy things from the business. And the cool thing is, when a co-op makes a profit, it goes back to the members, either in the form of refunds or lower prices. My instinct is to emphasize the ownership aspect -- e.g., "When we profit, you profit." But is that the best angle to play up?