I rarely use any of my Yahoo accounts so it's no big deal. I have 3 separate Yahoo accounts but for instance I'm always checking my uncle's Yahoo mail for one reason or another. It'd be cool not to have to launch a separate browser for logging into his account.Yes, that's different. Do you have other accounts, account aliases of a primary account, or both?
For the logins some people like to hide/protect their primary Yahoo username and use account aliases for logging in.
That's also different from what you're saying, I'm just mentioning it as an FYI.