I think we're being a bit hard on Peter Murray, whose business this is. He's retiring, and will need the proceeds to live on. While some of the exhibits were donated, they are his now. I gave a couple of bikes to people who race, and was not offended when they sold them on.
I don't imagine Mr M has been living the life of Riley off the income from the Museum, and he has had the upkeep of it and the exhibits over the years. It's sad it's going, but if it isn't making money, he wants to retire,and noone else is willing to take it on, what else can he do?