[PaulHoule]

Amazon is big but it is not the best.

Their momentum is going to work against them in the long term. Somebody who is in the Prime habit is going to order 20 items from Amazon waiting 4-7 days each time.

Someday they're going to buy something from another retailer like Adorama or Best Buy or Target or Walmart and get it the next day and say... Wow!

Amazon has the considerable advantage of having a larger catalog but who knows what fragment of the catalog is a scam.

[pipeline_peak]

It's not about being the best, prime performance, or the minority of people doing the homework to notice they're ripped off. There's no retailer who isn't failing to give you the best price. A lot of shoppers don't even use prime, as long as they get that free delivery, they'll wait a few days. The majority of people are buying from them as they grow into a larger internet monopoly. They've been invested in online delivery for a long time, so strongly that even Walmart can't compete.

Out of all the retailers you listed, Walmart is the only close competitor in terms of delivery, Best Buy still has tech, but not much outside.