You guys live in a different world, I think.
Two years ago I decided to antifoul. I thought about rubbing down the gel coat, primers, etc. and thought ' stuff that'. So, I just marked out the waterline and painted the stuff on.
I was certain
there was no polish on the hull (very important). Think I used International's cruiser a/f. It stayed on
. My cruising speed is 23knots and I rarely go faster - just the occasional flat out blow out at 40 knots.
Rubbed it down a bit this year to keep it smooth for third coat. None of it had flaked off or was loose when I rubbed it down. Used same stuff. One 750ml. tin cost £38 or so. Took me about 1 hour to apply with a small roller.
So, in answer. 1. It seems it costs a fortune for someone else to do it.
3. No. And, for my 5.3 it costs about £45 (paint and roller) and there's a bit of paint left over each time.