I have to disagree with some of this. I worked for a national chain pet store back when I was in college. We had an awesome fish staff that really cared. Animals got optimal treatment, multiple feedings daily and great water quality (from both H20 changes and filter cleaning). I can't think of time when we had an animal that didn't sell or just stayed the same size. I will say that often times even though that animal looks the same, it was a new animal. I personally was accused of things similar to this. Any sick animal was treated in a quar. tank, nothing was ever put down, given to staff or left un-accounted for.
I also hear what you mean about companies treating them like a product rather than an animal. But, not all places are like that.