When you forget a password, what do you do? You click "forgot
password", they send a link to your email, and you enter a new
password, right?  Which means that if someone can get into your
email they can get into anything. Sites get hacked and lose
so if you share passwords between sites it's really worth it to have a
separate one just for your email.
 For me about half the time when I see the "your password must have
one capital letter, two numbers, ..." I remember the password I
used. I wish people would put the password creation restrictions
on signin pages. Invisible at first, but showing up as a help
message once you enter your password wrong once.
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