Hey, if you have the cash lying around (and don't want to send it to me), then "why not!"

My bro-in-law/great friend has an import repair shop so I often seek his advice. I'd asked him about the recommendation of changing the oil at 3k miles vs. the manufacturer's suggested (gulp) 7.5k after I bought a newish car a few years ago. He said, "Well, heat is pretty harsh here and you do a lot of city driving. 7.5k is really a 'general' recommendation. You'd probably be fine, but I'd say with those factors 5k would be better. But, if you have the cash to change it every 3k miles, that's 'fairly cheap insurance' in my opinion."

Maybe your timing belt (and water pump while you're there?) falls into the "Insurance" / peace of mind category.