What am I going to do with these rulebooks that I'll never use?????
My last box set, I turned into a travel edition of Battletech, by adding some older plastic minis to the included ones, printing out extra sheets, and adding extra mapsheets, pencils, and dice. This way, I can toss that box in my trunk whenever I go on a road trip, and have all I need for a variety of Battletech games on hand whenever I can convince someone to play a game.
If all you've got to spare is the rulebooks, perhaps keep them for when you find someone interested in the game, and loan them the book so they can read it overnight and be ready to play the next day?