
Rubbish. :-) Although there may be the odd person who would go to that extreme it won't be very many. I know several Scottie exhibitors that would never.
What you will find is most gay tails are actually slightly low set tails causing the curl in the tail. If you look at the Skeleton of a dog and see where the tail is you can see how this happens.
In my own experience and from talking to others it is a very very hard thing to breed out. One of my first bitches had it and produced it in her puppies when mated to a beautiful dog so I scrapped the whole line.
EDITED TO ADD, anyone with genuine experience will spot a low set tail whether it is fixed or not. Just like fluffy coats that are thinned instead of stripped etc etc .