Re: What Am I doing Wrong? Probably nothing wrong.  Lots of factors to consider:- 

Time of year - after Christmas, people on holidays, getting ready for back to school.  Lots of other sale places now, such as Facebooks buy, swap sells etc etc

Have you researched your products on eBay eg how many already listed, the pricing, etc etc.  

One I did look at quickly and that was the fancy dress costumes, at a quick glance there are approx 86,261 being sold at any one time.

I sell second hand books and compete with approx 8 million listed books, I average approx 1 sale a day & it has taken me since 2007 to get the sales that I have.