There are also many more additional services that someone in the Apple ecosystem has access to vs. when the 4S came out, which can account for a portion of that

There are also many more additional services that someone in the Apple ecosystem has access to vs. when the 4S came out, which can account for a portion of that $27 marginal difference. Example (that I serendipitously learned about recently): free (!!!) workshops in Apple stores that you can learn advanced techniques for things like video editing on iPad, among other things.