Not to beat a dead horse, it's not the limited allocation, the waiting time or the inconvenience of snail mail that scares me off.
It's the stories from long term supporters of the winery about inadvertently missing one year due to a holiday, or whatever, and suddenly plummeting down to the lowest level allocation. Or even worse, mistakes being made by the winery that lead to missed orders or problems and then a subsequent reduced level of allocation.
