Shipping fees charged by sellers on ebay have no connection to the real cost of shipping the unit. They are, very often, a way to build the profit into a transaction and high shipping charges provide a couple of other advantages to the seller.
Since ebay charges for the transaction based on the selling price, exclusive of shipping, a seller with a low price but a high shipping fee makes more money than the other way around. The other advantage is that often a seller will offer a refund of the purchase price, but not the shipping, if a buyer is satisfied. If the profit is built into the shipping fee, the seller hasn't lost much.
You can see it at its most extreme from some of the oriental rug vendors on ebay. You can buy a decent rug for $.99 if you're the only bidder but the shipping fee may be $99.
There's nothing wrong with that scenario as long as you know what you're getting into and calculate the shipping cost as part of the total value.