First off, I'm going to say you can just clap to this response, I don't want to take up too much of your time :)
I also think he might have been overwhelmed by how quickly the money was raised.
That's astute, the publisher, for example, really determines the style of the book. I mean, the kind of anti-establishment, queer anarchic fantasy that is Margaret Killjoy's 'A Country of Ghosts' wouldn't suit your run of the mill fantasy publisher.
I like the message from that YouTube video, seems like something we could all learn from. We have all got our pet peeves and we all get disappointed when people just don't recognise 'the genius' of something we've set our hearts on. In the end, it really does become an impossible balancing act, especially if you try to follow the tall order of pleasing everyone.
But don't a lot of authors end up revealing their pen names down the line? I'm thinking Anne Rice or Stephen King, later his son, Joe Hill. I suppose some of them have satisfied their need for anonymity and would like to be associated with their 'newer' work so they can branch out under their own name. I guess with Rowling it was really a matter of the time she was writing-today we've got loads of YA writers like Holly Black, Roshani Chokshi or Lev Grossmann who make their adult fiction debuts under their own name.