Could easily be contractual with game publiasher. "You can sell this bundle for X dollars. You can not split the bundle up for individual sale". I'm sure they

Could easily be contractual with game publiasher. "You can sell this bundle for X dollars. You can not split the bundle up for individual sale". I'm sure they don't want to argue over in court whether refunding half of a 2 part bundle counts as individual sale. Or, the bundle contract could easily out law partial refunds.