I think small teasers actually help in the product sales. Even if malik eventually posts the entire book online, many people (myself included) would read through the post, and drool over the stuff that will come out. I dont think that any amount of cutting and pasting and printing can ever replace the book- especially the wonderful art that is DND.
When the Deities book was posted on the web, I had little interest in it because why would the stats of the GODs matter when you have mortal players? But the teasers made me think of how interesting the pantheons were, and of all the cool things that I can get the Gods to do- DM is more powerful than GODs- and so I went and got the book.
Not taking anything away from the book's contents- which was very well done- but the clincher was the artwork. Lockwood and Reynolds are the most awesome fantasy artists i have ever seen.
Sure- if someone decided to scan and post every picture in the book, you can DL and printout a perfect copy of teh book and have Kinko's bind it- but there is something missing from that-
Even if the entire book is posted, i will still pay the $30 and get it if not just to support my local game shop.