"Lean" is being used to justify increasing amounts of inanity. Please consider how you might be using up public goodwill to look at new startups by wasting people's time with nothing.
Lean principles are there to make sense of an idea before too much time is actually wasted developing it. I would say that getting a hundred people to spend 60 seconds reading a landing page and then signaling their intent with a quick click is much less wasteful than months of development on an idea that may not have any real market. Going onto the street with a clipboard and survey doesn't really cut it todays world...
I was quite happy to help, as i was with the buffer lean landing page before.. i would hope that if i wanted to do the same type of thing to validate an idea, that i could count on the tech community to help...