With all due respect, my guess is that if he even has a Dumble to begin with, he must have some sort of idea as to what the current market value on it is :laugh2: This isn't an amp you'd stumble upon in your father's closet that he calls "that 'ol thing".
If I was Bill Gates sure i'd buy it, more to say that I had one than anything else. As a normal human being I'd rather get 4 cheaper awesome amps, some handmade guitars, all the pedals I would ever need and an old van to transport it all haha. Then save the rest of the money for college.