it is if you don't use it, but many people shop mostly or even exclusively on the platform. order more than once a week and it's a fair value. i know some who make 10-20 orders a week and every day is a 'prime delivery day'.
WTF I thought my one order every one to one and a half weeks due to my sheer laziness was getting excessive.
As for Prime getting commercials, it's a good thing Prime somehow manages to have barely any content worth watching where they could possibly insert commercials for me. I'm assuming this will not apply to movies you pay to rent.