Amazing write up. I have been through it (now in a second startup) and can relate to most of it. This is like the book I can read as summary of my journey through startup world.
I havent read all responses above, so excuse me if this is repeated information.
To answer your question, you have to understand how VCs operate. How they raise money from other institutional investors, rich folks etc and how they need to return that money in a finite time (4-5 years) Everything comes down to money for that reason.