> Just because you don't prepay (but pay as you go) for fresh water doesn't mean that everyone has that luxury.

If my local water supplier would offer the option to pre-pay, I might take it. I don't think it would change anything about how I use my water, if the price stayed the same.

(I am pre-paying for my mobile broadband, and I don't notice me using it any different than people who post-pay.)