What makes a laptop or notebook so damn expensive and high-priced??

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Since I didn't have enough money in my Paypal account, plus the fact that i'm now recieving SSI paychecks from the government at this time, i've decided to get myself a laptop from eBay, because normally, from what i've seen and from the prices shown at any store (offline and online), laptops are almost expensive and out of my reach. So I decided to find one that's less than $100 dollars, and in this case, since I got $41 dollars in my Paypal account, something less than that. But every time I see laptops on eBay, as well as stores like Best Buy, Circuit City, Wal-Mart, Office Depot, etc., laptops are reaching from $100 dollars to several thousands as much as up to $10,000, and perhaps even more than that. To add salt to the wound, when an auction for a laptop or notebook is almost at an end, i've noticed that people will start bidding desperately like crazy to get their hands on the little piece of mobile computer technology that I've dreamed of acquiring. If a laptop or notebook starts off at a few dollars, near the end of the auction the price skyrockets through the roof and becomes like the other expensive ones at the brick-and-mortar stores mentioned earlier. This made no sense. Desktop PCs are clunky, heavy, and yet cost less than their portable counterparts. So why do laptops and notebooks cost more money, and like the topic title says, what makes a laptop or notebook so damn expensive and high priced??