
In addition to being effective at drying your hands its also effective at saving money. This analysis of the savings of a Dyson Airblade shows that over a year a business can save about $710 per dryer. The machines cost $1200 - $1400. So they should pay for themselves in around 2 years give or take.

Say you spent $1500 to get one and have it installed. Your initial cost is $1500. Assume you save $710 in paper towel costs over a year. 5 years later you would have saved a total of $3,550. If you had taken $1500 and put it in the bank you would need to make 18% annually to equal $3,550. So installing a Dyson Airblade at a business is like investing $1500 at 18% annually.
Now it should be said that installing a hand dryer is not going to be worth the cost unless you get a certain amount of use. The savings analysis cited assumes that you have 100 uses per day and many restrooms do not get that much use. It would certainly not be cost effective to install such a device in a family home.
Now I know most people don't own businesses that have restrooms getting 100 uses a day. But you likely have opportunities your own own home where you could spend a bit of up front cash to get a good annual savings. Buying and installing Compact Fourescent Lamps (CFL) or simply buying a reusable grocery bag are a couple examples.