Of course cameras are a distraction, it's an extra piece of equipment to think about and people tend to lose a bit of common sense when they know they are or someone else is recording.
However, imo it isn't true across the board and I don't think it's really jump number specific, you're going to have people with a thousand jumps that geek for the camera while you have people with a hundred jumps that just want to show people what they see without a second thought. It's the nature of filming in general, some people get ballsy when they're recording, this applies to cellphones, gopros, full cameras, anything - others are more modest with it. This is why you'll get one cellphone recording of a shoot-out (and always vertical for some reason) and not 20 when you know everybody there had a cellphone. Of course, people with more jumps will have more knowledge of how to get out of a messed up situation.
I'm a bit curious as to the number of incidents with them as a snag hazard, or getting caught in risers. To note, I jump at dzs that only require 100 jumps to use a GoPro or Contour and far more for full camera rigs, and I'm also still a newbie myself so of course I'm coming from one view point.
Of course the GoPro Hero 3 has gone a long way in deterring jumpers, as they can never tell if it's going to record to begin with and seem to be saying f- it more often.