Feedback: - Disarming and unlocking chests should be worth it since they cost lockpicks / tools. A trapped and locked chest should not contain just an agate or 10 gold. (I'm looking at you Zentharim hideout), especially not after sneaking past several aggro npc's. Risk / reward kind of thing.
Or just don't have them be expended, I don't recall ever having purchased a set of thieves tools in a tabletop game when it wasn't at character creation.