I think that's the wrong lesson to take. The reality is that no company is going to appeal to everyone--and a relative who's disconnected from "anything internet" probably never would have used Groupon. You've learned something about your target market.

A good lesson for everyone is that our personal needs from a business aren't the same as everyone else's, even tech people. After all, I'm still a little in shock that Bingo Card Creator sells for $30.