Truthfully, if a determined hacker decided to hack my account and pay my bill, I'd probably be okay with it. :)
All kidding aside though, I guess I can see why they implement tight security (although I think they may be going a bit overboard with that many questions). I could see a disgruntled person trying to get back at a neighbor by trying to hack into the neighbor's account and have the gas (or electricity or whatever utility) cut off. There's the inconveninece factor (utility turned off and potentially 1-2 business days to get it turned back on), as well as possible fees for turning off/on (although in the end they may be waived when it's determined the owner didn't actually authorize it).