We know people with bad intentions are watching this site. Stick with the same account for too long and you run the risk of revealing too much personal information about yourself. It is a good practice to swap out accounts regularly to keep your identity safe.
OPsec is about being careful, not paranoid. Usually it's the scared ones who end up with the biggest vulnerabilities.
That being said, never password reuse. Only takes one database breech for you to lose everything.