In my eyes, the application is free and has a lot of benefit in just doing it. It makes you think about your idea in depth and asks questions targeting different areas. For example, you may have thought about how you are going to get a user base, but have you thought about how you are going to get the first user, the second, and third? Have you thought that far in the beginning? When I looked at the application this was the question that stumped me, because I had a general plan/idea as to how to go about getting users, but not something concrete that could help me get the first few. So now I'm rethinking my strategy and have some better ideas for my app.

I would still do it. The worst that will happen is that they say "no".