John Ellis in Fast Company: "Once a company thinks of its customers as a revenue-extraction resource, the game changes. Yahoo changed."
The problem with Yahoo has been that it doesn't give customers a chance to pay for useful services. I recently shut down an 1,000-member Yahoo Group because Yahoo had made it completely unusable with intrusive ads. (Example: Sometimes when you click a link to read a mailing list message, Yahoo delivers an ad instead.) There was no option to subscribe and take the ads off.