Daily Deals sites are attracting millions of customers. It’s a lively marketplace with hundreds of companies competing for a limited number of users and businesses willing to give them a try.

How lively? It’s hot. According to researchers at Lab42, there are more than 660 deals sites online today. But is this sustainable? Certainly not all those sites will survive. Some of us here at Mashable are questioning whether the Daily Deals era is coming to a close.

via What’s the Deal With Daily Deals? [INFOGRAPHIC].