This weekend I got my eyebrows threaded at a cart in my local mall.

If you're not familiar with it, threading is a process where the root of your hair is pulled out with a piece of string (sounds great, right?). I've seen threading done before, a long time ago on a college trip to India, but I've never had it done. The cart looked very professional and since the rate was inexpensive—only $10 for eyebrows—and I actually needed an eyebrow wax any way, I thought it'd be fun to try.

But before I took the plunge, I had to ask… "how does the pain compare to waxing?" I wasn't overly concerned because there was another customer getting her eyebrows waxed and she wasn't screaming out in pain, but I was relieved when they said it would be less painful.

My husband was with me and he was very excited because he thought it would be great to capture the experience with his cell phone camera (what am I going to do, he's a techie).

As I sat back in a slightly reclining chair, eyes closed, I realized what a great business model the cart had. They had absolutely no product costs and the cart was super busy! In my short five minute visit there were five customers. If the cart averaged 10 customers an hour over a seven day period, they'd be grossing $8400 per week with only the cost of staffing and rent!

What a fantastic business idea!