LOL. I feel the same way about 10mm brass. I usually start picking up brass after I am finished shooting. If I find a 10mm case, I spend twice as much time looking for more.
I have joked in the past about picking up brass for calibers I don't shoot, and then buying a gun in that caliber once I get enough brass for it. Sounds funny, but seriously, being able to find free brass at the range in a given caliber means that brass will likely be available for it in the future. I bought a Desert Eagle once I found enough 50AE brass to fill two mags.
Obviously, I have a low threshold for justification.