For this I will be buying your book! Thank you for your initial sacrifice.

The consumer doesn't get to base vendor choice on the merits of the vendor.  If you don't give Best Buy or Wal-mart your business, you can't have the content (or in this case, you can't have the content for 3 months).

It's a deal that benefits the vendor and the developer.  What is the upside?

I understand the benefit to the developer (and retailer), but it isn't something I enjoy seeing as a consumer.  Depending upon the game, exclusive content itself, and the vendors involved, it sometimes bothers me to the point of just dropping the purchase altogether.

I'll wait the 90 days (or more, depending upon when/if the content gets released to everyone) just like all the other Stardock pre-order customers.  It isn't as if I have a choice.

Will the book exclusive fall under the same terms?

Up until just now, I thought the book exclusive was a mod or addon type content that you'd use within Elemental.  What you just wrote makes it sound like a stand-alone product that either doesn't require the game to be installed, or (if it does require the game installed) runs entirely separate from main game.