The advice I always give, if it's a top ten seller on ebay, forget about trying to sell it.
The problem is people associate the most popular selling products with profits, but that is so rare as to almost not exist at all. There are some seriously big players on ebay, I'm talking about companies with plenty of resources behind them.
Company structures like these are able to choose a model that is big on investment to gain maximum buying power, giving them the best possible price. Their model then allows for them to list at very small margin, but make fast cash by sheer turn over.
You can bet that any top ten selling products on ebay has companies with models like this well and truly in the game.
A lot still see ebay has a place for the little seller, and while that reality changes every day, those opportunities still exist for sure. You just wont find them anywhere near where these big dollar companies are competing.
It's a big heard on ebay, and if your are just intent on following what others are already doing, the chances are you will be right at the back of that pack.
Takes a lot more than just a supplier to make money online, takes some smarts to make the most of those suppliers!