Most of the cost is in processors and RAM so those parts can be sold at end of life. There are server recycling companies that specialize in this.
Is it electronic-scrap or is it electronics-crap ?
http://www.inc.com/profile/cj-environmental
From the FAQs, "How does material get processed and refined? All materials are unique and subject to different methods of processing. Newer computers are refurbished and given new homes to maximize ROI for our customers. Scrap product is crushed or shredded before the refining process. All material is processed in accordance with all Federal, State and Local regulations. To learn more about our licensing and compliance measures contact us."