You aren't sticking it to GW by not buying the book. You are sticking it to the game store who is providing you "free" terrain, game space and space for a community. As others have said, it sets the precedent up for rationalizing newer players that it's cool to not pay where you play if you are "offended" by the pricing scheme. Where does the rationalizing stop? "I don't want to pay for a land raider because $75 USD is too much! To Feebay I go!" Seriously, it's a cop out.
Says who? You? That is hardly official. Please appreciate the difference between "a rulebook" and "everything to do with the hobby always and forever".
The comparisons to video games are invalid. If I buy a game my computer can run, I can always play it. This is different. I cannot keep playing my army in the game as is. At least not in any organized fashion at any store. 5th is dead. I am -required- to learn the new rules in order to continue playing the game, in order to continue using the army I have spent hundreds of dollars on. Do I feel like I should be forced to spend 70$ in order to do this? No. Am I? Yes. There is a huge difference between adding something to your army, or upgrading or whatever and having to spend money to continue.
And Please, I have never suggested to anyone that they shouldn't pay where they play, I make it a point to get models at all stores I frequent, though since I am at BG plainville the most, they get most of my gaming money.