I sent 3 issues a while ago, and was hoping to go to the Zineswap event (I think it was in November?) but couldn't make it in the end. I've only got one back in return so far.. were we meant to get one back for every copy sent in? I'll have to investigate... (saying that, I haven't been home for a few weeks, so there may be a few waiting for me when I get back!). But yeah, a great idea & the guys organising it all are lovely!
Yes, that is what I understood also - they keep the first two and anything over that they send you back one-for-one. They also have swap parties were you can sort through what's been sent for swap and choose what you get back