I had a friend bring me a knife one time that belonged to his grandfather, he thought it worth maybe $100. I brokered the sale of it for $11,000.00. It was a 1928 Scagel in the original sheath, mint. That same “friend” then tried to coherce me to back off an opinion regarding a serious building construction issue just 6 months after the sale. We are no longer friends..
At the end of the day, you have to be able to sleep at night.