We modified pretty much everything about our business around running the Groupons.
Still, I feel that our rep did a good job helping us out, much more so than another form of marketing would. Would you expect a billboard company to come to my business and tell me how to run my business more efficiently, make sure I can handle it?
We ran a radio promotion around the same time and they did ZERO insofar as making sure we'd be ok. It also cost us a lot of money.
Restaurants and coffee shops have more to overcome when running a Groupon, but that's their job, right? Pick a good marketing strategy, be successful, make good decisions, etc.