Comment was meant as a joke. I'm hardly interested in selling anything here, I can get a better SNR pretty much anywhere else for commercial purposes.
If you have used Stack Overflow (or, you know, Slashdot, who's been using Karma since forever) it's possible you may not have felt the whole thing was a "game". Same thing at work, an off site day is not "pretend you are nice so you get a pay raise" day. It's honestly meant to be fun. In the same way Gamification can be used for good purposes.
It can definitely be abused, just like any other tool. But if used in a smart manner it can reap great benefits.