My wife and I cook. We look up a random recipe that sounds tasty, make a list of ingredients we don't already have, pick those up at the store, and follow the instructions. It's not much harder than paint-by-numbers, which is what I expect almost every Blue Apron customer to realize at some point.
I don't mean to say Blue Apron is a bad thing - it's training wheels for cooking, which is great! But when the training wheels come off, so does the subscription. At what point do they hit the saturation point and the customer base tops out?