
The trick to making eBay work for you is doing your research. You also need to take advantage of all the third person companies and sites that have sprung up in recent years. They take the work out of eBay, and still let you make good money, easily. I like to think of them as a bunch of low wage employees that do my grunt work.
And that is the trick to making money. Find the most cost effective way to go about your business, and always remember that your time is worth money as well.