One of the easiest ways to make money on eBay is selling public domain information. I personally no several marketers who make thousands of dollars a month selling public domain information products.
The great thing about selling public domain products on eBay is that they have a huge market of buyers regularly searching eBay for anything old and rare.
You can also package these products in different formats, for instance if you find an old fishing book you can make it completely new and fresh by adding pictures, more text etc.
You can read the book into a microphone and hey presto you've got a great new audio product to burn to a cd and sell over and over again. There's a great perception of wealth attached to audio products, you could make a fortune if you created four or five audio products and constantly listed them on eBay.
There is no end of ways to profit from public domain information.
You can sell old books as ebooks burned onto cd's, you can turn the book into an audio product or even a dvd.You can also take a great old picture, screen print it on a t shirt or place it on a mouse mat.
One guy I know prints old sports pictures on tea and coffee mugs and sells them for huge profits.
The only problem with making money from public domain works is how to find real quality public domain websites.
Make Money on eBay Selling Public Domain Products