So if the problem is that prime-eligible items have their prices jacked up by the cost of shipping, thus negating the value of the service, the solution is to ignore the problem? Do you work for Amazon?
(Not the original poster, but...) I don't think that Prime eligibility, even when the item costs the same as a non-Prime item plus shipping (usually a fixed amount per category, not per item), is necessarily "negating the value of the service." Unlike a random shipping method a third party might choose, Prime shipping is usually two days and gives you the option to upgrade to next-day for a per-item fee. If you don't care how fast it ships, Amazon has also been doing a promotion lately where they let you choose super-slow shipping in return for a $1 digital video/music/book credit or occasionally a Prime Pantry credit that basically covers shipping, so you can build up enough of those to save on other products/services you might use. (I basically get an MP3 album or Kindle book for free every few months.)