At the company I work for, not unlike many other companies nowadays, they are really cracking down on people printing in color.

We’ve had several rounds of e-mails from executives (…or the executive’s secretaries, anyway), fancy graphs (in color) of how much more it is costing the company every time we print in color, and some people have put fancy tag lines on their e-mail signatures, but people continue to print in color.
The solution is NOT that we need more e-mails and threats from the folks who make much more money than us, the solution is actually quite simple: Change the default setting!
That’s right, this printer is currently set to print in color by default. This means, any time anyone hits print, they print in color. To not print in color, they have to go into the settings and change them such that they will only print in black & white. While this simple task does not take much time (just a couple of mouse clicks), it does take effort, and people are, by nature, resistant to expending any additional effort beyond the base that is required to complete their intended task.
Now, what can this failure teach us about how to reach success? Make the “default” lead to your desired outcome!
Another awesome example of this involves organ donations. In full text, it can be found here. Summarized, this study goes as follows:
When you renew your driver’s license, you have a chance to enroll in an organ donation program. In countries like Germany and the U.S., you have to check a box if you want to opt in. Roughly 14 percent of people do. But behavioral scientists have discovered that how you set the defaults is really important. So in other countries, like Poland or France, you have to check a box if you want to opt out. In these countries, more than 90 percent of people participate. This is a gigantic behavior difference cued by one tiny and costless change in procedure.
These examples should be more than enough evidence to demonstrate that you need to design your website, booth, product, marketing plan, etc such that, when a customer acts in the manner of least resistance, they are accomplishing your desired purpose. If you require any extra effort, you are losing sales and you are losing customers!