Read this analysis of Groupon's business, and I think after you do (and factoring in the company's CEO 2 years ago was a MUSIC STUDENT):
<a href="http://www.privco.com/private-company/groupon-inc" rel="nofollow">http://www.privco.com/private-company/groupon-inc</a>
...and I think you'll see the answer to your question is: duh.