Interesting idea for a survey. Mrs Pwalo works for our government's Stats department, and she just loves this stuff. She would no doubt point out the risk with self reported surveys, but that really is another argument.
But I have a hunch that most riders who are not using their bikes for the track, or constantly chasing the red line will have no clutch issues. I only use my N400 for commuting and shorter rides, so I haven't put as many Kms on my bike as I'd like, but I've had no issues to date.