Easier said than done?

Whenever a big book deal is announced, especially when the beneficiary is a celebrity, there's always blogosphere strife. People arguing that they were paid too much. That they can't really write. That publishing is a nepotistic, taste-bereft land of the quick dollar.

Here's a very nice video responding to that.

But, is this suggestion easier given than received? After months, sometimes years, of rejection, can one just forget about the book deal and write?