I had thought that electronic goods dealers (e-books, steam, whatever) had some issues with actually selling goods because of the fact that a sold good needs to continue to be accessible even if their platform becomes too expensive to operate at some point.
I wonder if we could shift the definition of sale to something more reasonable access-wise in the long term and come up with a reasonable path for resale since, with a third party host like steam, infinite transferability isn't really feasible - there are technicalities around account registration and the like that would need to place some limits on your right to resell the item.