"If you have a use for one, you could think "is the current price still good enough value for me", and if you have no use for one, then you could ignore it." I

"If you have a use for one, you could think "is the current price still good enough value for me", and if you have no use for one, then you could ignore it." It's about the future, too. If you think that the value to you in 2 months will exceed the price today, then it is rational to purchase it now (even if the value to you today is zero). It becomes more urgent when you think that the price in 2 months (when you need it) will be significantly higher. Additionally, humans are risk-averse, and a known price today is less risky than an unknown price in the future.