60% happy rate certainly sounds closer to reality than 97%, but am I the only person who thinks that's really, really good? Are there any forms of media/advertising that first time purchasers have above a 60% rate? I've tried different kinds of media and deals in the past, and had many things go abysmally bad. Print in particular. I think mature industries like newspapers, magazines, and TV commercials only have a higher satisfaction rate because they attrition'ed out some people who attempted that form of media. Once people figure out what businesses perform really well on Groupon, success/satisfaction rates will go up.
I'm thinking Groupon will work for businesses with high fixed costs and no variable costs (Chelsea Piers), businesses with insane margins (spas), and places that think they can replace a regular part of someone's life and get a returning customer (centrally located bagel shops, pizza shops, etc). Right now a lot of high variable cost unique experience type businesses are trying Groupon, and that seems suicidal to me, but eventually people will figure out what Groupon works for and what it doesn't.