One drop is not the end of the world, but it certainly adds nothing to the value. Only 710 miles on a 7-year old bike could be good or bad. A whole lot would depend on how it's been stored. Today's ethanol-dosed fuels aren't the greatest things for a fuel system when the machine sits around a lot. Old gas congealing inside tanks and injectors can be an expensive mess to clean out. But there are people who'll do it right and drain the fuel and keep the bike stored in a dry place, so a tankful of fresh gas might be all it needs in that regard. 7-year-old tires also might be ready for a change. Just musing over considerations and potential price-negotiation points. Definitely agree, it would make a dandy around-town bike.