I have somewhat mixed feelings on this. Yes, stand by your word. But it was not quite the way first described in media that they gave a formal offer and he said I accept. Rather he simply said he was firm on $50,000 as I understand it now. I am not sure how it would have played out in court in terms of a binding contract.
I think we should not say he should obviously have known true value. Vast majority of people do not know value of domains It shows the importance of getting outside expertise before deciding.
Re settling out of court, as someone in my 70's now, I sometimes wonder if legal firms take advantage of the elderly because they know they don't want to be involved in a lengthy legal battle in later years, or have it passed on to loved ones, possibly, to deal with. When I was 40 I would be more apt to fight an injustice in court than I would now.
Just my thoughts,
Bob