Because it is expensive and when your grandparents don't remember a time when food was scarce, but a lot of people can remember a time when money was tight it seems to make sense to not spend all that money on storage. (Until you reach the rich level any additional money goes to things like larger houses or nicer houses which means you live paycheck to paycheck and have about the same amount of money to spend every day - after all the deductions to pay for the above - as someone who is poor)
This is the same reason infrastructure in all areas is often left to rot - maintenance costs money and if the effects of not doing it are not immediately visible it is easy to stop doing it even if overall it makes your life worse in the long run.
Of course the above is easy to say. It is also easy to talk about places where you are an exception. However it is very hard to see the places where you are doing the same as everyone else and foolishly falling behind on something to your long term detriment. (also there are some people who talk about being an exception who are spending too much effort on things that don't need to be done)