James, that cracked me up! My first couple of seedlings made dog poo look elegant!
James is correct about everything. It's a good way to get the genetics of certain plants, even if the seedlings turn out to be dogs. They still have the genes though, so it's a good way to go if you can't afford the expensive parent, or don't want to spend the money on the expensive parent.
I've never bought seeds, and can't imagine I ever will. I prefer to make my own and hope for the best. I also can't imagine selling seeds, since I am positive that all of the good ones will end up growing somewhere else!