I've fill many BnP requests for folks that just can't figure out how to d/l and burn their own. I don't mind spreading the joy at all, but nowadays it's just for certain friends.
The thing I do mind is when you write up clear, easy to follow instructions for the BnP, and people don't follow it. Like send an SASE, but you get cash to cover postage, and no return envelope. I can deal w/ reusing the envelope, but cash means I gotta go to the post office. Then you get crap blanks, sometimes all beat up and won't burn...