My friends cupcake shop in union square was asked to sell their cupcakes for 25% of retail and at a loss in a very pushy way by groupon.
I have been on groupon for pretty much since they launched. I have bought in total (1) groupon. And I forgot about it and it expired.
I am not interested in the things they have, which are typically things I would never frequently buy anyway (skydiving, spas etc). Thus, I have never seen it being a place I would spend much money. I haven't logged into it for nearly a year. I stopped all emails way back as well.