One of the upsides of having a single group is that you all get to see what was sent out. In the print exchange, you generally only see a few pieces of work. That being said, however, if the postage or cost gets to be too high, you'll only get images from people who can "afford it" and will be missing out on some great images. You might want to see how many people sign up in the next round to decide what to do. If 200 people sign up, how many could afford it? If 100 sign up? 75, 60, 50...? I smell a poll in the making...