Pretty much anyone who is in the market for a mod is going to have their own atty or carto so that wouldn't be an issue. I would think the PV body, batt's and charger could just be wiped down or disinfected, and it's not that hard to test a PV to make sure it works properly on return. The seller could make it a non-warranted item if they chose to. They could even stamp or engrave that right on the PV. Or, they could cover it as they would a new one if they wanted, in the event it wasn't returned and the customer was charged for it. If they had a couple of loaners to use in this manner it would surely simplify things for buyers, and probably lead to sales for the manufacturer.