My wife persists with this (I gave up 4 or 5 seasons ago), but complains every week how dull it is and admits she's just sticking it out to the end now to see how it ends - I gave up caring ages ago, which was a terrible shame as the first few episodes were some of the most brilliant TV I've ever seen.
Like far too many US series (and now UK ones following the same trend), they string it out episode after episode with no goal in sight, just the need to keep it plodding on without any purpose except to make more money.
Somewhat ironic that a series about Zombies feels very much like the dead walking...
M