I have a friend back east who i taught how to use ebay and he does make lots of money off of ebay.. He owns a pawn shop though.. The way he made money was by taking things that were in pawn and once they lost ownership of the item he ebays it for the ammount that he paid for it..
So with enuff items you can make a million..
I made some descent money off of ebay when i worked for a company who let me buy stuff at cost.. and open box items.. I would get huge discount on audio items.. the markup on high end audio equipment is about 100%
so i would buy a harmon kardon reciever that retails for 1200 @ 600 then turn it around with a 800 reserve and end up selling it for 900+ because it was bran new in the box still
But the book is going to tell you most likely where to get items from to post on ebay to make money..
A good way to make money on ebay is to goto auctions and buy pallets of common usable items like a pallet of p3 laptops or something like that..
You migh find some good stuff at the lost luggage wearhouse.. but you have to go there its in huntsville alabama, I baught a laptop for 50 bucks there a few years back.