We are ALL that way!
I guess a better way of saying this is that even if the producer/dealer does EVERYthing just right, it still doesn't guarantee that the vast majority of the seed will come up that next spring, as it may also require certain conditions the fall of planting, that final winter, and then the spring they are otherwise ready to come up.
I have some evidence which suggests that if the winter or spring is too dry, the seed remain viable, but just won't germinate in ths spring. This would be an example of a condition outside the control of the dealer or the grower. So I guess what I'm really saying is that if the seed doesn't come up, it doesn't automatically mean someone sold you bad seed or seed that had not been stratified. (it doesn't necessarily rule out those things either, btw)