Someone posted a while back that
https://haveibeenpwned.com/ could be a good way for whoever created the site to check which emails and accounts are still active and have any importance to their users. If you search for your email on that site that means that it has some importance to you, it does make sense.
No I don't think it's the goal of haveibeenpwned, personally I've checked mail addresses that I'm not really using anymore. Moreover there is a feature that let you use hashes of your passwords instead of your raw passwords, so it's highly unlikely to be a honey pot.