I think part of it is also that one can leverage past platform/network effects too. Someone who has 5000 friends on facebook or 2000 twitter followers has a jum

I think part of it is also that one can leverage past platform/network effects too. Someone who has 5000 friends on facebook or 2000 twitter followers has a jump start over the one starting with less than 100. I think past success builds up to the next success. Build a smallish audience for the first book, leverage that and build a larger one for the next if that makes sense.