That may be true in the "land of the not quite right" where there are boat yards on every bend in the creek, bayou or street as it may be. Unfortunately it is not the case where I live. Only one Marina on my Corp of Engineers lake I think they were grandfathered in because they already owned the land. I asked the owner last week what it would cost to do my 23's bottom. Pressure wash, light sand and two coats of ablative rolled on. About $1350. In my estimation that is a bit more than "a few bucks".
Did it myself last time on the trailer and will do so again. Cost about $200 for the paint and supplies. Mine has keel rollers so I jacked it up on two 4000 lb. jacks wedged the bunks and never ever felt the least bit in danger. It was far more stable than the boats set on stands in the yard, in fact I have felt somewhat anxious about working under those although I have done it before.
When I had my Columbia 8.7, not trailerable, the yard would pull it, pressure wash it in the slings, and set it on stands for $125. Then you got three days before demurrage charges commenced and you could do all the work yourself. If you didn't buy your paint from them they charged I think $25 per gallon. If we planned well we could do the bottom, change the anode, and service all the thru hull valves and intakes in that three days. But now the yards will not let you do that stating liability issues. Of course, in Mississippi, many of the yards sold out to Casino's so competition is non-existent.
So Smith, you think this (my 8.7):
Is safer than this (my 23):
I actually did not use this setup. The plan was to drop the bunks one at a time. I found jacking the keel from the concrete with two 4k jacks and wedging the boat to the bunks with movable wedges with a space between for coating made much more sense. I never felt in danger whereas I always felt a little nervous under that 8.7 rig.