LOL. When does money become motivation. $1k/yr, $2k/yr? Most likely never (I think that is what I got out of Freakonomics). At one point I tried to get my company healthier to cut down on sick/doctor days, we got rid of the bad stuff in the snack closet, allowing the worst thing to be trail mix. A lot of weeks our office administrator would cut up veggies and fruit for the staff to snack on. They complained bitterly about that (especially vegetables).

Then we decided to pay for gym memberships, whatever gym they wanted to go to, as long as they were going. A few took advantage, and the rest complained bitterly that the few who were taking advantage were getting $50-60 a month more than those who weren't.

I would like to end this by talking about how much more productive and less sick that the staff was after we went healthy, but unfortunately the system was only in place for about 9 months before the economy went TU and all the complainers were shown the door. Although looking at it the staff who did not like healthy stuff, or exercise was generally less productive and easier to lay off.

Now everyone left goes to the gym regularly, but we all did before the program started anyway.