I just went skydiving for the first time last week and used a Groupon. It was fun but I wasn't immediately hooked and wanting to go again.
I paid $109 for a 15k jump that is normally $209. I bought it about a year ago (Used it because Groupon was about to expire). The facility was so packed that I had to reserve my time far in advance. (They sold 4,500 groupons the day I bought)
They tried some upselling, in the form of a video and a 2nd jump at a discounted price. The video was an additional $90, which I declined, and the 2nd jump was a "discounted" $125. This seemed kind of silly to me, as I'd only paid $109 the first time around. In the end, I wasn't upsold, so I'm presuming they lost some money on me. They also didn't collect my email address or anything. I think in the end the value you derive from a daily deal is very dependent on your ability to be smart about it (via upsells, social media, etc.).
Can you share a bit about the economics of a skydiving facility? I got the impression that the skydivers were paid per jump.
One other thought is that if I were to do it again - I've seen several Groupons for other skydiving facilities... I'd probably just buy another Groupon for another place... new view, etc. Maybe I'm in the minority but I think getting people to come back is tough when there is so much pressure from other deals.