Stoop , I hear what you are saying. But to my mind the Time Share and Villa Rental two different things really.
Time Share actually implies that most things are shared (maintenance etc) but it is perfectly reasonable that you would only expect to pay for the electric you use yourself. I would.
We chose to offer the Villa Rental as everything included - linen, electric, cleaning, Welcome Pack etc. This seems to work for us. I know some people offer some of these as extras (eg Welcome Pack) and I suppose we could charge by the towel, but it just doesn't seem to be the right way to do it.
I know that if I was a renter, I would want to know before my holiday how much I was paying and I wouldn't want worry about any bills at the end.
Vive le difference !