If the dealership only sells new and last year’s models, it’s probably less of a problem, though there might be a situation, when there’s only one or two models with a specific level of trim (that the potential buyer is interested in) left in stock and they’re all rented out. Assuming that all of these cars have similar levels of wear, which is not always the case. And even then many potential buyers prefer to have a look a exactly the car they’re buying.

And if it’s a used car dealership or a dealership that accepts trade-ins, there’s going to be a handful of models in single quantity.

For used cars, you absolutely need them on-site. The wear and tear is a primary determinant in price.

You also have a very diverse lineup on a used car lot, so the odds that you have something legitimately comparable is very low.