Let's see on Peace of Mind...
It doesn't do anything to (Mind-Affecting) stuff, which would actually be usable (not good, but usable) since "stay there useless" is still better than "kill your friends".
Uh... Magical traps? You can generally afford to wait those out. Too bad Sepia Snake Sigil would be worse (you're inactive twice as long but still need to eat) and for some reason, conjuration (creation) (and Temporal Stasis with the same effect is transmutation.). I recall at least one Phantasmal Killer trap in an AP, but even that causes issues (what's twice instant?).
Edit: Found a real stinker: Vestment of the Champion
. Personal only magic vestment at a reduced level for Paladin is a reasonable idea, but it's minutes/level instead of hours (not even 10 mins/level!). When you first get it it's a mere +1 to AC (+2 if you have magical knack) that doesn't stack with existing magic armor (which you should have by level 7). At hours per level it would at least make enemy anti-Paladins slightly more durable (If he has a shield and cast it twice that's +4 AC without giving the party loot), but at minutes it's useless.
Edit: Another one: Witchlight Lantern. It glows if it's within 30 feet of a magic aura... and doesn't exclude the holder's gear... or the party... or any active buffs. As written it's an Everburning Hooded Lantern at over 35 times the cost (worse if you cast it yourself). One use I can see for it is to hang it in a check point staffed by mundanes. Lets them see whenever someone enters that is either a caster or carrying magic items. Use this to enforce permits on magic and it will pay for itself reasonably quick.
Edit: Villain Codex has a group of scamsters with some very inefficent scams. Caravan Master's Wagon is a mundane wagon with hidden compartment dependent upon a 20,000 GP portable hole (because people who can afford that transport goods in wagons...). The efficiency of a Sucker's Barrel (Barrel that costs 2 extra GP and holds 75% while weighing the full amount) is dubious, especially since the scam is obvious once the container is empty so only travelers can not immediately be lynched.
Fool's Gold just plain old won't work, at least not on coins. We can start with that it's an illusion spell and all real world coins I know of, modern or historical, had different types of coins be different shape and size. I'm sure that would still be standard in a fantasy world where changing colors of things is a basic mages trick. The spell does work on art objects, but half the word count was spent on coins. It's also much more traceable (throw some "gold" coins in a sack and wondering why there's copper ones in it latter vs. buying a gold candlestick and see it turn to copper an hour latter)