Probably historical... it wasn't that many years ago that the Red Delicious was the go-to and it wasn't the mealy, thick-skinned apple of today. If you've got hundreds or even thousands of acres planted, it's a once a generation thing to bet on a new variety or move to a different fruit. I suspect today the red delicious market is two-fold: some government programs (think food banks) and the juice market. There might also be apple sauce producers etc who really don't care about variety, they just want cheap