Why if we buy expensive water faucets, we can't not buy sensor driven water saving faucets?

Question

Why if we buy expensive water faucets and fixtures, we can't buy sensor drived water saving faucets and fixtures to save water in our home, like in the shower, toilette, hand wash, in the kitchen when washing dishes or doing our dinner, this will cut water consumption almost a half or more, I know american people expend even hundreds in water fixtures that don't have sensors saving, a water fixtures whit sensor saving is the same amount an expensive one, and this save water that is already a priority on the world.

Answer 1

There are stand alone sensor activated units that you can buy and hook up to any faucet. try homedepotsupply.com. I have used these in several kitchen and bath upgrades and with creative decorating you wont even know they are there.
good luck !!!

Answer 2

Well, they ARE out there, as you can see at the link here:

http://www.chicagofaucetshoppe.com/index.asp?PageAction=VIEWCATS&Category=245

but at prices ranging from $325 to $530, I don't think I want to use this method of conserving water. I'll turn it on and off by hand, thanks!