Yea, they're jerks about that.
One time I biked that moosehead keg all the way to their brewery in Burnside on my bike trailer. I stopped at every brewery along the way (Propeller, Sleemans, etc) and they all told me to just go to moosehead because they couldn't use a moosehead keg, but that my plan would probably work.
By the time I got there, it was lunch time and the only person around was this dinky manager. I told him that I wanted to trade kegs if possible and he told me that the keg I had was stolen property. I then proceeded to play the homebrewer card, explaining that I wanted an all metal keg so that I could convert it into a brew kettle. Befuddled, he told me that he had never heard of kegs being used for homebrewing before.
I waited for him to go back inside and biked back home,
with the keg.