No planet is more earth-like than Earth itself, so if life really does pop up readily in earth-like conditions, then surely it should have arisen many times right here on our home planet? And how do we know it didn't? The truth is, nobody has looked.
I have never been motivated by money in my life. You can't make choices based on what the financial return might be.
I don't write all my stuff. Everybody always thinks that. But in just about every album I've ever had has been about 50-50 songs I've written or co-written and other people's songs.