Wired nicely details the difficulties James Krug has had in bringing his waterless urinal to market. You see, city codes everywhere he wanted to sell required that urinals be plumbed with a water source rather than just a drain. And the plumbers unions really really didn't like anybody who'd try to reduce their members' work.
Solution? The Universal Plumbing Code was changed to allow the waterless urinal, but only if a useless capped-off water supply were plumbed in behind the wall where the urinal sat; the standard plumbing work would then still have to be done.