what do you do with yours?
despite asking them not to bother they still keep sending them, specifically barclaycard (MBNA used to be terrible but at least they stopped).
I tend to condense of what they send (inc the original envelope) into the prepaid envelope they include and send it all back, it even better if I get to bulk it out with any other junk I have to hand. the fatter and heavier the envelope the better.
do they only pay for the returned envelopes and does it cost them more the bigger they are??