I don't mind, I even love the idea because I'd rather have as much human engagement as possible, but it will need OOC safeguards and placed in the hands of a trusted, reliable player who is around frequently. or it should just be in the hands of staff.
I say this because PDM is effectively an essential business, when we're able to purchase vehicles it will most likely wind up being the only place to buy them for awhile until the server grows in population to support a secondary car business. Core businesses like that should have no room for fuckery, no one who goes on long stretches of leave should be holding it. It needs to be reliably accessible and not a straight up scam or a money printer either.
Gov't should probably control pricing, allowing very thin profit margins to pay staff. There should be no "I dislike x, y, and z so they'll never get a car" sort of shit going on, otherwise we're just going to wind up with an NPC vendor to avoid the eventual drama.