Most profitable product!

They say that you can sell anything and everything on Ebay. It might be true, providing people wants it, and you are selling it at the right price. But at the end of the day, you need to sell something people need or want, and you have to be cheaper than anyone else. I used to be a stamp collector, and I sold $3000 of stamps on Ebay. And often, made a profit. Then I sold $1000 of old motor racing magazines and books with a 200% profit. But I could only achieve that, because I had bought the books and magazines 20 years ago. In order to make money, you need to be able to buy products with a 50% discount, so that you can resell it with a 25% discount, and give you a 25% profit, which is still not enough to cover your time.