$100 guides? Yeah, that doesn't happen around here and with good reason. I can only speak to my own local experience and for the most part guides are obsolete and are cheap. The only factor that really plays into actual utility is nostaglia and or collecting since the initial usefulness of many older guides has been usurped by online counterparts. Speaking specifically to this guide, I'm only interested since it was brought up as otherwise I would've never thought about the guide despite playing through Thief Gold countless times and having the guide would pair nicely with my original boxed copy. Having said this, even though it's uncommon doesn't necessitate high value out of the gate. I cannot think I'm alone regarding thoughts or interest in this particular guide being at premium.