TV series have a very positive effect on a comic book's value. If it were not enough that The Walking Dead has had five seasons, AMC just announced another two have been confirmed.
AMC is also behind the Preacher movie (Preacher #1 is on the Hot 100 as well).
This is definitely among the most valuable comic books of the modern era. Prices softened a bit about nine months ago, but have since bounced back thanks to the new seasons.
Stick to CGC 9.8 with white pages, unless you can afford a 9.9. Currently 9.9s are about 4.2x the price of 9.8s.
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