You bring up good point. But, for example, I tried another company for pieces and parts for several projects. The only other US alternative to Amazon for such things is NewEgg. Where items cost nearly quadruple what they are on Amazon. Not including the shipping times (24 hours instead of 5-7 days).
I guess what I’m getting at, is Amazon is the largest monopoly in history, IMO. There’s no way for anyone to compete. Even the $140 a year is pennies in the grand scheme of things. If you require items that can’t be acquired locally…