For one, Comic Book Men has never been much of a ratings juggernaut, which is fairly expected for the kind of show that it is, which is basically Smith’s crew lovingly embracing different slices of pop culture in often silly ways.
Kevin Smith revealed that AMC contacted him personally to let him know that the execs weren’t going to go ahead with a Season 8 renewal.
The viewership rarely surpassed a million people in the later seasons, and the key 18-49 demo rating was usually around a 0.2.
No big and clear-cut reasons were given for the decision, but several factors come into play here.