Internet marketers make their money online by using a niche or a group of things or ideas that will focus on a large group of people or traffic to their website and if you use this form of marketing on eBay, you can see your finances increase. When you do this you are focusing a group of people on one thing instead of trying to sell many different things on eBay. This works if you are trying to sell content, articles, and ebooks on eBay. The more information you can put into your store the more the people will come to your page to either look at your product or buy it.
If you are selling an ebook on eBay, make sure that there is a demand for it otherwise you are wasting your time and money since eBay charges you if you list something and it does not sell. If there is a market for your product put some eye catching titles to bring more people into your page because odds sells. Plus if you are in a niche topic people can always look you up to see if you have more of the same thing for sale.
If you are into the market to have fun and make a little money while you are doing it then try to pick a topic or something you know a lot about, this way you can just write off of the top of your head. Whatever you pick or choose to do make sure you are going to like it for some time. No one wants to end up doing something that they do not like to do for an extended period of time because then the task just becomes meaningless. Also this works to if you want to make money doing some freelance writing as long as you pick a niche that suits you and your interests.
On the other hand if your goal is to have fun and make money at the same time then you might want to consider entering a niche market that you know something about or have a passion for. The reason for this is that selecting just any niche might require that you do a bit of learning to better understand it, but choosing a niche market you already know about and enjoy means you get straight to work on making money while doing what you enjoy doing.