WoTC made: Psionic Handbook.
Non-WoTC: I've got way too many RPG books that I will never use. So if I could classify anything not written for D&D, Warhammer, Palladium, GURPS, L5R, or Star Wars that I own (and that still leaves me with quite a few books), then I would say that was the biggest waste of money.
Question: What is "wld"?