I've resisted the urge to build actual game mechanics into my business for fear of what it would do to my social life. (It wouldn't be too hard -- make a quick Rails plugin to duplicate the Stack Overflow badges functionality, add a few hooks into my pre-existing stats code, maybe add a post-commit hook to... NO, NO, NOT GOING TO DO IT. But dang if the gamer in me doesn't see every problem and start thinking of ways to kill the dragon... preferably ridiculously efficient ways of killing the dragon without all the work that the designers intended me to go through.)
More seriously, why do you resist? I mean, what is your perceived downside to implementing a gaming type of system in real-world work?
There is an element of fun
you find the fun and snap!
The job's a game.
The wisdom of Mary Poppins.