Here in Oregon, most of our gas is 10% ethanol.
Non-ethanol gas is available but it is almost always premium.
This to me is worth the extra money for 3 reasons.
1) It improves your gas mileage. Alcohol has a stoichiometric A/F ratio that's half that of gasoline. Since you have 10% alcohol in there, that means a 5% reduction in fuel economy.
2) Alcohol absorbs moisture. Obviously if you're in an area with lots of humidity and your bike sits, corrosion of the fuel system can become a problem.
3) The extra octane is insurance. If your engine overheats or has other problems, that extra octane will delay and lessen the severity of pinging while your limp you bike to a place you can stop.
Since I'm getting almost 60 miles to the gallon, the extra cost isn't that noticeable.
The increase in fuel economy saved my ass today as I took a risky move in not stopping for gas on my way back home from Eugene (did a whole round trip without gassing up). I coasted into Sisters after having ridden 330 miles. I don't think I could've ridden that far on 10% Ethanol gas.