How long do bikes last?
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NevadaWolf is getting close to 100K miles on her Ninja 250. I have a 1988 Ninja 250 with 139,000 miles on it, but the motor was replaced a couple times according to the previous owner.
10,000 miles wouldn't bother me. But as JKV45 says above, there are a lot of other concerns with you buying that bike.
FWIW, I'm married with kids, have some very abused Ninja 250's that I am resurrecting. Just because I take care of my bikes doesn't mean that they haven't had a rough life before they got to me.
You really liked that Ninja 300, wait until Sunday.