you don't need any of these accounts or need a correct name, address etc either; these accounts become useless once you redeem for once per account lifetime awards say PC points etc.. however if you are redeeming for a tangible good then you need the account to have the right address if it is sending you something tangible.

in the end once you zero out an account, there really is no reason to keep it unless you have a couple points and want to save up for a completely different product then "I guess" it behooves you to use the same account