Perhaps it's different with Prime, but Amazon has burnt a lot of my trust with their non-prime free shipping.

They have a huge warehouse infrastructure in my city. They could drop a box in the mail at their warehouse and have it to me in a day or two. They could probably strap it to a stray dog, point it in my direction, and get it here in three.

Yet, somehow, if I collect up a $25 order of in stock items, they can't get it to my door in less than about two weeks, unless I pay a premium for upgraded shipping. This makes it useless for time-sensitive orders.

Now, I know there's QoS and framing as a marketing thing, but this just comes off as a tease.