I've seen orchids sold in pots without drainage holes. I think they must have been placed in those right before being shipped to the store. Also, stores that don't specialize in plants don't usually provide the best care for orchids. Orchids wrapped in plastic with no air movement, being watered from the top with the water just sitting stuck there between the leaves...And sometimes the orchid displays are right by the door, so in winter you could add the cold draft to those problems. That's my guess. Also, it seems some of these stores expect you to just throw the plant out when it's done blooming anyway. Some people don't even know that if cared for properly, the orchid can bloom again in the future.