While their amazon webhosting sucks I couldnt live without amazon shopping
I save so much with the free shipping alone that it covers the prime account cost. Wife watches movies and tv shows off of it all the time too.
The generator I bought for the house would of cost a bunch to deliver but free shipping with prime. That thing weighed like 200 pounds or something.
Last but not least is the buyer protection part with scams being so rampant now. My parents were always the look for the best deal types. Id get something from prime "safely" they would find the better deal and it turn out to be a scam or ripoff site.
Oh one other thing I forgot. Since I buy 99% of my stuff from them I can go to order history and find something I bought last week or years ago and click reorder.