The short answers are:
- Yes, a fancy cancel will increase the market value of a stamp.
- Yes, fancy cancels are often faked.
As for Dr. Skinner's book, until you decide to pick up a "real" copy, the US Philatelic Classics Society has an electronic version available online here:
http://www.uspcs.org/resource-cente...ic-library/3.
Speaking for myself (but yes, I am a Society member), please make complete use of the online resources offered. If you download any of the pdfs, please consider making a small donation. Better still, become a member.