You're stepping over a dollar to pick up a dime. The brass is worth 5x the aluminum.If you collect aluminum cans, drop 3 or 4 primers in each can, before crushing.
If the scrapper in your town won't take primers, just wait until you drive to a larger town. Either T town or the City, just take them with you and cash em in.
100 lbs of primers is currently worth $150-$200. Damn sure pay the gas.