Heh...
My seven year old cousin got a little 3 gal fish tank for his birthday. His mom bought him the tank and supplies, and my mom took him to buy him fish. They get to the pet store and the guy in the fish department says, "I won't let you get anything but a Betta, for that size." Not a goldfish, not even a few neon Tetra's - when those usually live happily in a bowl. This tiny tank even came with a pump! So my mom looks at the Betta's... And he informs her she should get two females, because males can't be together and to only feed them FOUR PELLETS once a week. Yep...
Not only did the one Betta kill the other(too small a tank for them to live peaceably together), but ONE fish was eating ALL the pellets, so the one that died was not only being tortured, but starving as well. I had to inform my aunt of all the problems they had and what they needed to do to keep the last one alive.
I've also had pet store people recommend various, horrible wood chips for bedding, and had others recommend crappy, non-nutritional food to many pets as well.
Not to mention the number of cruel(and often unsafe) devices pet owners can get these days for their pets, and are told are the best, when these owners don't know how to use them properly in the first place, and that item gets turned into a cruel weapon.
I'll turn this bad stuff around though, and tell you about one time that I decided to test out a pet store employee on their knowledge. I told them I wanted the BEST dog food for my dog, as he had epilepsy, and that I was looking for something without preservatives, because they gave him seizures. Not only did she recommend the food I ALREADY had him on(she did not know), but she also pointed out the reasons it was so good for him. I was quite happy with her knowledge on dog food and even spoke to the manager about her. I wish there were more knowledgeable people out there working in pet stores.
I also must say, my buns are currently in pet store cages - they both came to my home in them. But Crush has had his for three years and gets lots of out time, and Fluffy JUST got here the other night, and is getting as much out time as Crush now(whereas she used to live in it 24/7) - I'm trying to bond them while I put aside to get the supplies needed for the huge NIC cage I want to build. I plan to build a two or three-tier cage though, with a wooden frame, so it takes up less floor space, as my house is quite limited in size.
That said, I do recall many years ago when these cages were acceptable, if not considered large at the time, with the added exception of giving the bun's roaming time and exercise outside of it. If I hadn't found this forum before I got Crush, I never would have known that so much had changed.