If vanes are so bad for accuracy,then why do all pros use them in competition?

Of course some do use feathers indoors at 20 yards but not outdoors with distance.
The tounge-in-cheek retort was close to accurate but I will add that most pros are using vanes under 2" in length so contact is much less of an issue.
Of course pros are not trying to steer broadheads or penetrate an animal.
I prefer vanes for an archery setup because of the repeatability in a dozen shafts.It is much easier to get all arrows to shoot the same with vanes because all vanes are exact and you can't say that about feathers.Vanes also will usually give a lower profile that will give less wind drift at distances.
I use feathers now for hunting because of the forgiveness and added foc.I also like the way they look.[:-]Also when putting them on helical with a helical clamp,I have found that Arthur was dead on when he stated that noisy feathers is most likely because they are not put on with helical clamps.I have found them to be as quiet,if not more quiet than vanes and they ARE quieter than AAE or Duravanes.
They both work and work well when setup properly.