yea the video was very well put together, but not once did you address the very important nuts and bolts as to what exactly mean with the $3.99 swap. do both

yea the video was very well put together, but not once did you address the very important nuts and bolts as to what exactly mean with the $3.99 swap. do both parties mail their books at the same time? why the $4 fee? what does that money buy? to me, this looks like you could get leapfrogged by a facebook app, which says a lot. also, is this $10 an investment or a donation? do we get any equity for purchasing?