"Secrets of the Game Business" by the Charles Media River series is a good read for anyone seeking a look on how publishing works.
Only about Half-way through, but the 4 or so sections on publishing really opened my eyes up a little.
Things the book stresses
1.) Publishers aren't the enemy
2.) Design Docs. don't get you publishing deals all the time.(Except for Sid Meier,etc.) You need a working model.
3.) Any Publishing Deal is not always a good Deal
4.) Publishers don't negotiate through e-mail all the time. They want to see you in person.
Well, for the other 6 and the "why" you'll have to buy the book.
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There are only about 4-5 people on this forum whom I'd trust with my own work. All of which are established, and already sold commercial products.
A book? I hate book. Book is stupid.