You didn't hear any knocking from the motor? Was it running? Seriously, I wouldn't pay much over 6 or 7 thousand. If taken care of it will last you a lifetime. But you can find another with more mileage that was also taken care of for much less. And it will also last you a lifetime.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R