Hey Goldenboy,
I have a true story for you.
I use to live in Hawaii. I have been a diver forever and have had an interest and have kept fish for even longer. Put all that together and you can figure I use to catch a lot of fish for the aquarium trade.
One day when I brought in my catch I tried to stir up some business, the folks didn't want my fish because they said that their LFS QT'd all their fish before sale. No need to argue with a true believer.
The point is that fish store was the same one that I sold most of my fish to, and I often saw them turn right around and sell those fish right after I brought them in.
The fact is, no fish store QT's fish unless they are obviously sick. It's a business and the longer they have their livestock sitting there, the more it cost them, especially if it dies.