How to convince someone that piano is not worth $10,000

[amanfang]

My great-grandmother (who is 101, soon to be 102) has reached a point that she had to move into assisted living nursing home (this after MANY good years of good health and living alone).  So my grandfather is working on cleaning out her house, selling some things, and giving some things to relatives, etc.  So anyway, she has a piano.  It is a baby grand Wurlitzer, but my  grandfather thinks it is a "full-sized grand piano."  Whatever.  It is probably about 25 years old, and probably hasn't been serviced in about 10 years.  The outside of the piano is still in good shape, it's just not a great piano to play (even if it were in tune). 

Anyway, my grandfather is trying to sell this piano for $10,000.  He cannot be convinced that he will be lucky to get $2500 or $3000 for it.  He keeps asking if my school or church or music friends would like to buy a great grand piano that's been played very little for $10,000.  And more, he says, Wurlitzer is a "well-known" company.  Hahaha.  Well-known among musicians in that you don't want to buy their pianos.  Anyway, any thoughts on how to convince him otherwise?  I was thinking of suggesting that he find a technician to go look at it and give him some advice.  I might need to find one for him...neither of us live down in Florida where the piano is though.

[nyonyo]

there is demand and supply. When there is no demand, he will reduce the price.
I believe in Micro Economics 101.

[dan101]

Go the 'technician' route. Then you'll both get an estimate of its true value. You can also call a retail store and ask how much they think a piano of your description is worth. Pretend you're looking to buy when you ask.

[iumonito]

Offer it on EBAY.

I have played several very good old Wurlitzers, by the way.  When you way baby grand, do you mean it is about 5'4"?  If it is bigger, he may get closer to what he is asking.

[amanfang]

I haven't played it in about 10 years or so - at that time it hadn't been tuned in a couple years, and I am sure it has not even been serviced since then.  I do not know the exact size.  I think he's just going to add it in the estate sale and see what he can get for it.