I dont know that app.net hits the right ($) spot for that user group. The implication of facebook's revenue is that users are willing to trade privacy and data ownership for about $4/yr (the current monetization rate of a facebook user), which means getting to $50/yr seems somewhat arbitrary and hard to decode.
I think at some point in the future people will see $50/yr for those two things (privacy and data control) as a relative bargain. I do today, and backed this proposal due to these concerns.
I think driving developer investments may be critical to getting to their funding goal, and frankly they are offering to take away a potential threat and not making a strong enough case about what value they are adding. It often requires an explicit threat to get people to pony up for security, not an implied threat.