Coffee.net is of course an excellent domain - memorable and prestigious - and therefore has considerable appeal, and hence "value".
But the previous posters are quite right - .net gets very few typeins. Our best .net only gets around 75/day (wrestling.net).
.org gets more typeins than .net, but of course then you need to factor in whether or not people who type .org are in a frame of mind to actually part with cash...