The logic is that you are preparing for a future ascension, so you want to make sure you have those items when you jump through the gash. That isn't nearly as important now that you can buy things from the mall and then pull them mid-run, but there was a time before you started playing when that wasn't possible.

So, the entire "items to stock" feature was made to do something you aren't interested in, and therefore you should probably not use it.