Pretty sure this would be illegal in the EU. Consumer protection laws provide a right to return, perhaps someone should suggest this to US lawmakers?
Abuse can occurs on both sides. I think OP's example is a corporation going too far, but there are examples from both points of view. There was a great example where a band held a concert in Central Park. The staff went to Best Buy to buy all their digital cameras, used them for the concert, then returned them all a few days later. Essentially, "renting" cameras for free. Then Best Buy was stuck with dozens of opened, used cameras.
I've also heard a coworker who did the same thing--she uses it for vacation, then returns it when she's back home and got the photos off. That way, she says, she always has the latest and best camera instead of an obsolete camera with a dead battery that won't hold a charge.
I have a friend who buys one of each kind of competing device (for example MP3 players) with the intention of keeping only the best, and returning all the rest.
Heck, I've seen people on right here on MR return iDevices over and over and over again due to some perceived "problem" like they didn't get the better of the two manufacturers who provide LCD panels, or CPUs, or batteries for the iDevice.
I frequently see EU citizens complaining that things cost more in the EU than they do in the USA. These kinds of EU laws provide valuable consumer protections, but they also enable abuse, so naturally they also add to the cost of doing business.