A small income is better than no income at all, so why not charge $10/year if you can, and the customer won't mind? I also suppose that charging a small amount

A small income is better than no income at all, so why not charge $10/year if you can, and the customer won't mind? I also suppose that charging a small amount regularly is a garbage collection mechanism. If you stopped paying attention to your empty account, it will run into negative, and eventually be closed due to that.