If a shipment enters a region that is below freezing, it can definitely have a negative effect on the paint. I had thousands of dollars of this very paint shipped to me, and it was frozen when it arrived. Even after warming up, it was destroyed. It turned into a jello - like substance and could not be remixed/shaken back.
The other issue is shelf life. You never know how long the re-seller has had the product in inventory. If the product has a shelf life of 1 year, and it took 6 months to sell that particular bottle - the customer now has a product with a shelf life of 6 months, and they won't even realize it.