Elodan said:
With all of the game material out there how do you find what interests you?
How do you decide on your purchases?
Here's what I generally consider before deciding on a purchase:
1) book's existence - I gotta know that the book even exists. This pretty much exclusively comes from what I read at ENWorld. If it's not mentioned here (either in the news, reviews, or threads) I likely will never buy it.
2) subject matter/topic - this has to interest me, otherwise it's dead in the water.
3) ability to preview - I need to be able to flip through most of the book and see what's in there, look at the maps, etc. If I can't do this, then it's very likely I'll never buy it.
4) minimum useful content - after flipping through it, I have to be fairly certain I'll use 80% of the content in my game (sooner or later) - I call it my "80% rule".
5) experience with company - I'll be more likely to buy a book (even up to the point of sight-unseen, which, considering my guidelines I adhere to above, is a pretty big deal for me) if I had a bunch of good experiences with the company's products in the past. Necromancer Games is an example of this.