Selling on E-bay

Many companies do not look at Ebay as a valuable alternative for selling their products. Why not? If Ebay was a nation, it would be the 8th largest nation in the world. Can you not find a customer? Here is the most expensive item that sold last month on Ebay for an amount of around $160,000 or so. It also had around 180 bids, I believe. Would you fly in it?