I'm way too cheap to buy something like that myself, but I see a clear value proposition. Firstly, if your use rate is variable (maybe you bake only sporadically), that breaks any regular subscription. Secondly, it removes the human error of possibly failing to cancel the subscription, or failing to order.

The problem with subscribe and save is I don't know the periodicy of how often I use most items, other than the ones in the grocery store, and I'm not shopping at Whole Paycheck.