Works 60% of the time, every time
Well, all it is is an index / price list. Admittedly, that's what it says on the back cover so I only have to blame myself buying it. It would have been a great book if the two thin volumes would have been combined into a thick hardcover, with descriptions of different variations. For example, a Death Rattle is worth 500 GP and described in AC04-059, but the book doesn't tell me what it does, what the difference is between a death rattle and a summoning rattle etcetera. And how is a violin / wine bottle rack magical in any way?
In other words, it's not an encyclopedia, it's an index. So yeah, as an index it's useful. As an encyclopedia? Not so.
(Heh. Coming to think of it, I can think of other bad products, it's just that this particular one was such a personal disappointment that it immediately came to mind, probably related to wrong expectations )
I'm at work right now so my copies aren't handy. But that's not how I remember it. I remember them having an XP value and gold value, followed by the description of its effect and various notes. This can be seen here