Growing up, I was quite embarrassed of my father. He collected used stereo and TV equipment. When I was young I thought maybe this was normal for everyone, but upon visiting friends houses I realized that one generally only has one TV and stereo system per room, not five or ten. I avoided bringing friends to my house because they thought it was weird. One girl who came to my house was very confused when we started to watch TV because she couldn't figure out which one was associated with the audio, as all 7 of them were turned on at the time.
As for me, it was the latter. I was an electrical engineer at a local airport. Responsible for fixing much of the tv and audio equipment, I was kept very busy most of the time. One day a friend of mine who worked security at the airport brought me his receiver and asked me if I could fix it. I opened it up and discovered that it was very similar to the equipment I worked on, so there was no problem fixing it.
I knew that I had to think of something to do with all of that used stereo equipment, and I had to do it fast. All of that work promoting my venue had left me dead broke. Soon, I would have to sell off my collection. Then it came to me. If I sold used stereo equipment, I could feed my passion.
Often we'd find equipment at the side of the road, pick it up and take it home to find out that it worked perfectly. An hour or so of cleaning and testing and it was ready to resell. No matter what my dad got for it, it was all profit. There aren't many businesses that can boast that. Over the years my dad has branched out to other electronic items, but used stereo equipment and tvs remains his bread and butter.
The great thing about used stereo equipment, as opposed to other kinds of electronics, is that it is easy to tell whether or not it is in good shape. Used stereo equipment either works or doesn't. If you're buying a used computer, it might work for a few months and fall apart. With used stereo equipment, however, this is almost never the case. Usually, what you see is what you get.