Question here.

Why not place a solid call-to-action during the advertisement for people to visit their website and sign-up?

All they said was "visit Groupon.com".

All Groupon needs is your e-mail address and a zip code. It seems like they could have baited people with something and really grown their subscriber base?

Am I crazy for thinking that was a wasted opportunity, or does that not work well with such a massive audience?

Maybe the agency they hired only does branding and couldn't fathom the thought of getting direct responses?

Curious.