In my opinion, the entry-level pricing plan is too expensive. $10 for just one site? I guess it depends on how much functionality you provide. Also, once someone has a potential customer list, will you make it easy to integrate with services like Mailchimp?
But on a higher level, has anyone shown that lean-startup launch pages like this and Launchrock actually work? To me, the whole practice seems a little anti-consumer - saying you're going to launch something before actually putting any real effort into launching it. If one person does it, yeah it's clever, but if everyone does it, we're going to have this environment where people won't know if they can trust sign-up pages because half of the time they'll be for non-existent products.
And can putting up a launch page without a product to back it up really produce a significant volume of data? Getting people interested enough to sign up with a product seems like a difficult enough task.
To me, if you have an idea, you should have more conviction to put at least some effort into it. If you're just indifferent and throwing ideas out there to see what sticks, are you really going to be passionate about the idea that gets interest?