While one may or may not get interesting feedback from the exchange, I mainly do it, because I know I'll push myself a little harder and print to a higher standard if I'm participating in an exchange with other photographers.
While it would be nice to hear some feedback from people, I think I'm more interested in seeing what others are doing... It's also a great way to collect photographic work from all over the world.

My thought was to keep things unmounted so that the new owner has as much freedom to do with the image as they please. I was also thinking of supplying as much technical information as possible (so that they know what they're looking at if they like the paper, tone, contrast etc...)

I'm good to go...