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.
Imagine your cake day not being the same day as the anniversary of the site :tofu-cool:
Imagine not having been a beta tester, back when we could reply with embeded images, yet made an account a day late when the main site was launched