If you're buying used its always best to buy from an individual, first owner if possible. Then you know how it was maintained and ridden. I have 19K on my 04 SV650S and it rides the same as the day I bought it with 7K on it last october. I change the oil and am quite anal about the maintenance since small slipups can get me hurt. I track the bike several times a year and it still runs great. Focus more on the condition than the mileage. As far as brackets breaking, that can happen the day you pick up a new one or 10 years later. I've seen several bikes over 20K that ride better than nearly new ones. Some bikes have lower mileage increments for maintenance than cars, especially valve adjustments, and many people don't keep up with it. If the early services weren't done you can get a bike with 5K on it that clatters worse than one with 50K.