Andy,

if you drew those images in the manual it's intellectual property and you can get the evilBay to drop those auctions and even ban the seller.

further more, when you sell the manual require some kind of check box during the check out process, like any electronic transaction, "I here by agree not to copy or resell this..." makes it easier to prevent public re-sale in the future

this reminds me, I need to order one, looks like it will come in handy soon!