I can't stand them. I understand they're supposed to be a "bit of fun" but I think the santa cams just show an inability to discipline children. I wouldn't want to rely on "Father Christmas is watching" to encourage my child to behave. I'm watching, and it's me she should behave for. It's kind of like the whole "wait until your dad gets home" threat, I wouldn't want her to think of me as the messenger that isn't in charge.
As for the elves on the shelves, why?? Making mess that you'll just have to clear up yourself.. and teaching your children it's funny to squirt ketchup over the kitchen or unravel toilet rolls?
Write letters to santa, open your advent calendars, decorate the xmas tree. Why encourage or laugh at bad behaviour?