Yeah, i am a nurse so i know all that. I also have a lot of experience checking kittens. We ran a chain of pet stores in Canada and people gave us their puppies and kittens. We dewormed them and gave them shots. Then we sold them. But if they were sick, we would not take them and would send them to the vet. Our vet said we were doing a better job finding homes for the animals than the pound.They do usually have a litter fee that's cheaper. Imagine the price of 8+ babies. Temp is more important, because it can make the animal sick if temp is up.
Another thing about vaccines is they need to stay cold. Vet offices can keep them cold but store workers tend to leave the boxes sit out. So basically if you get a bad batch due to temp you are basically giving your animal a shot of water. This is what drives me nuts.
Store clinics are usually ok because the people usually bring all the supplies with them in a cooler from the office.