The milage all depends. These things are 4-strokes so unless you are worried about 10K on your car I wouldn't worry about the engine. It's everything around it that could need work. You also could see something with 2000 miles of hard farm life or 10,000 miles of bro trail riding every weekend in the same condition. You will be paying a premium for low-mileage stuff for sure, but I wouldn't turn your head quickly at high-mile stuff either. Just take a hard look at it and rationalize the risks and benefits.