i couldn't agree more.
I run a UV on my qt tanks for at least three weeks in combination with my summer attic temperture, about 84ish, or throw a heater in there in the winter.
I haven't had a fish with ich that I needed to specifically treat for it in a long time. Bacterial infections and other critters, a few, yea, but ich and other parasites are pretty easy to protect your fishes against. if I don't feel very confident where the fish came from (any store that doesen't separate feeder tanks from the main system or just a crappy store in general) I start with 1 tsp per gallon in addition to the UV, and would up it to 2 if the fish started showing outward signs.
If the fish comes down with something else, then, I do a big water change and treat for the current illness, and ich takes a back seat, unless of course, the fish has the outward sigs of it.
My experience.
A little prevention during qt ought to save you a lot of headaches 1 or 2 weeks into the qt and the fish just started showing signs of ich.
Whenever I get a new fish, I always ASSUME it has ich. It has nothing to do with convenience or any other guilt trip your trying to put them on. As far as I'm concerned, all fish store tanks have ich floating around, and if not floating around, laying in the bottom for a few days waiting to explode into a million more parasites. That statement was a bit arrogant, and mozart obviously is asking the question because they do not want their fish to come down with an easily avoidable parasitic infection.