> You need to ask why does gasoline contaminated with ethanol still exist

The two mandates that together promote this are mandates for share of renewable fuel use and mandates for gasoline oxygenation to reduce carbon monoxide emissions; ethanol-containing gasoline helps meet both mandates (the latter is applicable to certain markets at certain times of year.)

> Drivers would save tons of money if they'd refuse to buy it,

Well, yes, refusing to buy the gas that is sold at the pump would save lots of money.