Yea I can confirm that because I did a very similar thing except with Fortunejack, I dont know how but I forgot or misplaced my record of balance with them.  I was on the original FJ sig campaign long ago so think it was from that deposit.  Literally years go by and yet when I return Im able to recover my details the balance waiting for me, that is the way it really should be.   Its not a gold bar or some kind of cost to maintain, just a number I see no reason why they cannot just be a safe holder of funds like anywhere.
   The problem is in FIAT currency is now a given any savings you have will be wiped out if you leave them there, some people speculate eventually this attitude will extend to pensions and people will be destitute/reliant on hand outs.   I understand archiving, banks will archive a current account but even a plain bank wont absorb the balance and argue its now theres.