Judge upholds $30M Judgement against Ebay...what the?

The AP is reporting that a federal judge upheld a ruling in favor of a small Virgina based companies claim of patent infringement by EBay. The article states:

The dispute revolves around eBay's "Buy It Now" option, which sells
merchandise at a fixed price instead of fluctuating bids. MercExchange contends
the system tramples on its patented technology.

Since when is buying merchandise on line at a fixed price an infringement of a patent? The article concludes with:

Since the legal tug-of-war began, MercExchange's payroll has shrank from more
than 40 employees to three. Thomas Woolston, MercExchange's president, is trying
to revive the company's growth by licensing patents to other e-commerce sites.

MercExhange is the name of the company that filed the lawsuit...hmmmm...I guess patent holding companies are a thing of the past...at least with respect to Internet intellectual properties.