3. Some offers aren’t for true “businesses.” I’m all for supporting small businesses, but I’m not all that jazzed about going to the apartment of someone I do not know for music lessons (one deal for piano lessons was actually at someone’s apartment). It appears that there’s a very “Craigslist” approach to these deals, meaning there’s little to no investigation into whether or not these business are legit. At least with Craigslist, you know the risk, but with a major group buying site you at least expect them to confirm that the business is, well, a business.

4. Popular stores rarely offer deals. Many popular businesses have been turned away from using group buying sites for several reasons, one being that those who buy the deals rarely convert into long-term customers.

5. There’s a strong chance you’ll get sub-par service. Several years ago, a friend gave me a gift certificate to a spa that specializes in facials. The facial was totally heaven, so when I found a group coupon for the same facial at 50 percent off, I was totally stoked–that is, until I went to the spa. From the moment I walked in, I was treated horribly. I had to wait 30 minutes for my appointment, and my 60-minute facial was actually done in 40 minutes by a trainee.