Just as a counterpoint, since not all things are in and of themselves bad, including wal-mart.
When I was but a wee lad, 5 or 6 years old, when mom would take me to wal-mart, she could drop me off in front of the fish tanks and know that I would stay right there, completely fascinated, until she came back for me. I have always loved fish, and water.
Well, at the time there was this nice lady who worked the pet department at our local wal-mart. (Try to find someone dedicated to that dept. nowadays) But back then they had a pet dept manager. Seeing my fascination, and given that I was a quiet and troubled child, she invited me and my mom to her house to see her fish tanks. Gotta love the small town. She was an aquarium NUT. When we got to her house, I saw the most amazing thing I had ever seen. A 120ga aquarium with 2 BIG oscars. Well I was hooked.
I talked mom into a 10 gallon gold fish aquarium and set out to start keeping fish. I was maybe 7 years old by then. The nice lady that ran the pet department, man I wish I could remember her name but 30 years have not been kind to my memory, wasn't there when we came to get it.
Mom bought me two goldfish, which promptly died an hour after being dumped into the tank. I was crushed, so we went back to wal-mart. The pet dept manager lady sat me down and talked to me for what seemed like an eternity. She explained the best she could (and I was already quite advanced even then, my career in the sciences was an easy prediction) the nature of the nitrogen cycle, and acclimation, and temperature, and all the things I needed to do to make my fish happy.
Over the course of the next few years I built what is still my favorite aquarium ever. 10ga with an angel, a goldfish, a couple of swords, and a couple of tetras. Every few weeks we would go to wal-mart and she would ask how things were and never failed to teach me something new. I learned a lot about keeping pets in general, but fish in particular.
Fast forward 30 years and here I am with a reef tank. Her advise is still with me, all these years later. I credit this one woman almost entirely with giving me the ability to enjoy and love this hobby. She taught me that it is more than just putting fish and water into a glass box. The head start I recieved there has been the key to my success both with cichlids and now with reefs.
All this from Wal-Mart. I wouldn't be here without them.