I've gotten 4 or 5 offers for different cars at carmax, and sold one to them. If you have the right car, a car they want, you will get a competitive offer. Fair does not mean retail. It means a fair WHOLESALE offer. They are reselling your car for a profit, if their business model is not obvious to you. They want no-accident 2-4 year old low mileage popular cars in popular colors and will pay well for those. They don't want Teslas because they are a pain in the ** to have on the lot and a pain to sell, in fact they will probably auction it.