The solution to this can be rather elegant.
The problem with the argument lies in the presumption that one’s salvation can be denied, exchanged, etc. at one’s will. The person’s salvation needs to belong to them.
However, this is not the case. Salvation is God’s, and it belongs to him even when bestowed on a person. Thus it is being rather presumptuous to wish to do whatever one wants with it. The saved person has no intrinsic right to their salvation.
Thus, as it is impossible for anyone to barter with their salvific status, one should not be guilty about not using it to obtain salvation for others. One may as well want to trade their ability to fly so that someone else might have a purple unicorn.
Incidentally, this gives the same philosophical benefit that Duckett wanted out of his argument.
