You can save different identities using one password and then every time you sit down at your computer you can just make up new details for those identities in one password so that when you go to the mall, You're not always Chungus McGrungledunk, but sometimes they're going to be offering a free trial to, Faurtstick Blastschish or whatever name I give the email address I spin up for the purpose.

It's good to register a burner domain that you don't care about and once you have the processed enough different identities through it simply stop renewing it and sign up for new one.