Vtool, Zapperplans.com doesn't sell paper, they sell Zappers! The plans are free, and they don't sell them in any way shape or form. I bet if you wanted it on paper, they'd print them for you and mail them for free. I'll show you. Click here --> http://zapperplans.com/plans.html the $10 is for a fully esembled Zapper mailed to you including copper ring elctrode thingies that you don't have to use, but you can if you don't have any copper pipe. Any way, if they make any profit at all, I'm sure they are doing at least as much good with it as any other Zapper seller. They are really nice people and have good customer service from my own personal experiance ordering from them.
You are right though, it would be a rip off to BUY plans for $10!