Who dat?

I just listened to a newsitem saying that fraudsters can steal the identity of bloggers who give away too much personal information. For example, if they've got your real name, where you live and your approximate DOB (from your zodiac sign), they can track you down in the Electoral Register.
But it's all a bit puzzling. I cannot understand why anyone should want to be me: I live with me all the time, day in day out seven days a week, but I sure wouldn't if I didn't have to.