To put it one way, yes. By offering these coupons, you will be incurring a loss. Let's say you normally charge $14 for a haircut, but with the coupon you are only charging $7, that's half of the amount gone right there. Not only that, but the coupon sites themselves take a large sum of that money as well. The numbers aren't openly available but I believe they vary per site and depending on what type of coupons you're offering. Often times I've heard they can be upwards of 50%. That's another $3.50 from your haircut gone right there, leaving you with a mere $3.50 which barely even covers the cost of your haircut employee.

BUT WAIT, can you put a price on such quality advertising? If you compare this to putting an ad on TV, a magazine, the paper, or anything else, it probably comes out cheaper and delivers better results. I mean, look at all of the companies that are offering these deals every day, across all of these sites!