This will work if you have discipline. However, people like me will see a huge credit on the water/electricity bill and then decide I am rich enough to flush the toilet (and use the electricity-consuming fan) more often than I do when I am feeling frugal. If you maintain your typical money-saving habits, then I say go for it. But if you are like me, you will just end up wasting the credit on your bill by flushing the toilet each and every time you go potty (and wasting money using the bathroom fan/light when you want to see what you are doing or make it stink, as well).