A question about Conrail's SD80MAC's

I did not relize that conrail was the only railroad to have thease! why was that? why did other railroads stay away from them?
 
From what i have read about them in the past couple of weeks, Conrail was the only railroad to put in a order for the SD80MAC's. Conrail had to put these locomotives together because only partially complete SD80MAC's were sent from EMD. From there it quickly made its way down to the famous Juniata Locomotive Shops in Altoona, Pennsylvania, where shop crews completed the unit's construction and applied a new Conrail paint scheme befitting such a special breed of locomotive.