postcardware: n. A kind of shareware that borders on
freeware, in that the author requests only that satisfied users
send a postcard of their home town or something. (This practice,
silly as it might seem, serves to remind users that they are
otherwise getting something for nothing, and may also be
psychologically related to real estate `sales' in which $1 changes
hands just to keep the transaction from being a gift.)
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