I could definitely see how the smell could evolve after being left out of the foil. You’re correct about the Arko in bulk prices. That is a smoking deal for someone that loves Arko.A note on your Arko stick... it is often to be found for not much more than $1 per when one purchases a dozen. Leaving a stick open will allow the scent to dissipate with time. If one enjoys the performance, a reduced scent and being able to call it very inexpensive may help with the decision to use it.