As well as the staff, here, do to prevent spam from getting in, accounts would be hacked less if two things happen: 1. People use long and complex passwords, and 2. the staff uses SSL/TLS to make sure that passwords aren't stolen by MitM.
The first one isn't completely realistic - most users STILL don't understand that short, simple, all lower-case passwords are easily hacked.
The second one won't completely eliminate accounts being hacked, but it will go a LONG way in significantly reducing it.
And, no, I don't use the same password for other sites. I've been internet security minded since before it became a huge issue.