It's different for every person, but many of these folks are working on these projects on the side, and a daily value-packed reminder to keep pressing forward can be useful. We've seriously received tons of feedback from the developers who have signed up, telling us that they found it really valuable. YMMV, but give it a shot. Unsubscribing is always just a single click away :)
EDIT: More than 100 people have signed up in the last hour, so I guess someone finds the concept interesting.
Very interesting! Do you think because of a sense of community and 'industry solidarity', or as a function of outright competition. That would be a really compelling distribution to analyse. I guess 'build an app' doesn't necessarily mean 'that monetizes' right, so could be fun! +1 for me :)
Solidarity, and community is almost certainly part of it. When doing an independent side project, the fact that nobody knows the difference makes it easier to let it slide. Just having someone know about your commitment, even if it's a computer, can make a difference. It's someone similar to the difference in success on quitting smoking between people who sign up for a committed quitter group commit program vs those that just do it on their own.
EDIT: More than 100 people have signed up in the last hour, so I guess someone finds the concept interesting.