How do I sell my Groupon voucher?

Social shopping sites like Groupon and Living Social are all the rage these days. Instead of looking for a deal yourself, these websites create deals for a certain number of people. When that number is reached and enough people are interested, the deal is closed.

Otherwise no deal.

Groupon is becoming so popular that businesses are complaining that they can't handle the traffic that a Groupon deal can generate. How to contact Groupon live chat support & Groupon cancel support team.

So what happens if you see a fantastic offer but can't use it for some reason? You could try to get your money back (Groupon offers a full refund), but that won't always work. And if it's a really good deal that a lot of people want, wouldn't it be cool if you could sell it to the highest bidder?

Now you can.

Enter websites like Coup Recoup and Deals GoRound. They bring people together who have offers they want to get rid of with people who missed those offers and want to get started. If you have a voucher that you no longer want, you can sell it. If you want to have access to a store you missed, you can buy it. How to fix Groupon live chat & Groupon refund problems.

It makes sense for websites like this to appear with the increasing popularity of services like Groupon, but there are concerns about security and fraud. Duplicating internet vouchers is a fairly simple task, and will stores really check vouchers three times to make sure they're real?

I'm curious what Groupon users (and other social sites) think about sites like CoupRecoup and DealsGoRound. Are these valuable services that you would use or just extra work without a real payout?