Also, note that rich people have a tendency to engage in charity anyway; this suggests that once you have enough money to buy whatever you and/or your family might want, you gain more utility by giving it away than you can obtain by buying more stuff. Conversely, if you don’t have enough for things you want or feel you need, the idea of giving it away to other people might be of lower utility.
(This assumes that utility is both relative and personal, of course, as otherwise it is impossible for two persons to profit from trading with each other.)
Also, note that rich people have a tendency to engage in charity anyway; this suggests that once you have enough money to buy whatever you and/or your family might want, you gain more utility by giving it away than you can obtain by buying more stuff. Conversely, if you don’t have enough for things you want or feel you need, the idea of giving it away to other people might be of lower utility.
(This assumes that utility is both relative and personal, of course, as otherwise it is impossible for two persons to profit from trading with each other.)