Why waste your hard earned gold when you can create separate dummy “banking” characters that just hold bank accounts for you to store your stuff in.
Do you have a guild that has a cool name, but want to join another guild? Leave one of your dummy toons in that guild and you won’t lose it. You can even use your guild bank for storage (even though it is expensive to get one @ 100 gold for the first bank slot, 250 for the 2nd).
I have multiple characters that I use for banking. Saves me lots of time, and gold.