Great motivation to stay on task. But...

Sometimes I see a deer, or a fox...

...that would be my new distraction. Constantly looking up to look around and see. I guess you could say this isn't different than being in the office though.

Regarding the bandwidth restrictions, sounds like a possible app, (maybe this exists). You get to set a cap and you get some sort of penalty if you go over. Ask a user to key in credit card details and collect $x for each gig over and you add a little more in incentive.