So does anyone know where the account worth tab went? Or did I just miss a notice about it? It was all wonky and buggy, then it wasn't there anymore. I'm super curious about my breakdown and a little bummed :/

The page was removed.

Here is a link to Keith's posting with his reasoning for taking the page down.

if you have a GA and are willing to create some shops and do some work you can do a workaround to get something nearly like this data. All shops will show you something like this at the bottom of each page: You will earn 9,549,012,577 sP if all of the items sell at their lowest price.

Take everything you own of one kind-of-thing that Account Worth rated and shove it in one of those created shops. This won't help for the 'books read' valuation since those are gone and in your pets' brains, but for most things you can do this.