In the past month, what app makers have to spend to get the attention of Apple device users has risen out of control. That’s a tough fact of life that could make survival hard in the Darwinian mobile app ecosystem. Solving this problem is going to require a lot of innovation and clear thinking. And if it isn’t solved, we’re going to see a number of mobile app companies start to die. If Apple and others in the ecosystem don’t handle it right, it could be a bloodbath for developers.