You sign up for them and never close them. I probably have nearly 50 credit card accounts alone and since they're free of monthly/yearly fees, I really don't have much motivation to close them.
On top of that I have two retirement accounts, four bank accounts (not counting various accounts AT those banks), and more. They collect if you don't weed them out.
On top of that I have two retirement accounts, four bank accounts (not counting various accounts AT those banks), and more. They collect if you don't weed them out.