I'm not sure you can legally sell a download version of a program. Also, there is a page on eFrontier that addresses resale of their products and it's a big no-no. I believe they've been having eBay auctions selling their products, shut down.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi