Each store has to make its own choice about its own QT process. Personally, I like the store to take care of QT, and I look at the price of a "fish" as the actual fish plus the service of QT. I'd gladly pay 50% more for the average fish for the service of a quality QT process run by someone knowledgeable about the typical ailments common in the various fish species.
I do regularly buy from sources that don't run a full QT process, but then I have to do it myself, which takes a lot of extra time and effort, especially since nothing on my QT system is automated, where as virtually everything on my regular system is.