I also had my details leaks via the MtGox.com hack. Fortunately I have been using a password manager for years (Keepass) and don't share passwords site-to-site. So I don't fuck around with security, or try not to.
But, you do. It's hindsight, sure, but if you read HN you definitely know better, yet you did it anyway. You've learned your lesson, and hopefully the next time a service you frequent is hacked your exposure will be minimal. But it took something like this for that to happen. I'm thinking a lot of sites have had shitty security for years like Hover et al and are only now, with all the publicity surrounding recent breaches of security, beginning to realize they can't get away with it for much longer.
So just like anyone can cut you some slack, I can cut organizations some slack, for now, especially in cases like this where it looks like someone without the requisite technical expertise was given too much control over technical decisions (i.e. not the engineers' fault). That kind of shit happens all the time even if it ideally shouldn't. But, things have changed and security concerns have gained enough publicity that even clueless middle managers should have some inkling that it's important, so IMVHO if you haven't gotten your shit together security-wise as an organization by the end of this year, you're probably inept enough that I shouldn't be doing business with you.
In the meantime I'll practice the security diligence I preach.