A dealership's blue sky is based upon what a buyer thinks it can produce in net profit. If potential buyers think it cannot produce a profit, the store will not sell. If it can produce a profit, then variables such as desirability of location, the balance the brand will bring to other existing franchises owned, whether or not the factory will require facility upgrades, and so on and so forth, determine whether or not a buyer will buy that particular brand, in that particular location, at that particular time.
