I do not think it means what you think it means.
Whenever you become anxious or stressed, outer purpose has taken over, and you have lost sight of your inner purpose. Your state of consciousness is primary. All else is secondary.
I played Clank for the first time last month and I thought the person who taught me said you couldn't buy two backpacks, but now that I've bought the instructions I don't see any rule saying you can't. Am I wrong in assuming that you can?
Likewise, are you allowed to purchase both keys to prevent other players from going in locked rooms?
Yes you can. If you have the money.
Edit: The designer answered this question here: https://www.boardgamegeek.com/thread/1653134/market-items-li...