Nothing wrong with insecure passwords
- on insecure irrelevant sites
I use the same password on any number of forums and support sites where I really don't want to spend the time remembering them and a breach would be completely uninteresting to me.
Half the sites probably run old or homegrown forum software and dump the password straight into the DB in plaintext anyway.
I combine this with a disposable email address in case of a spam overload, but so far they're all so irrelevant that nobody has even bothered to hack them and the address is pristine !