The potential problem with having multiple tiers of products is that people have naturally formed negative reactions to up-selling from previous bad experiences with other vendors. Which then interacts with preconceived notions of what a self-published book might be like.

http://en.wikipedia.org/wiki/Upselling

http://en.wikipedia.org/wiki/Trojan_horse_%28business%29

http://en.wikipedia.org/wiki/Bait_and_switch