The popular Jin Yong novels are DGSD, LOCH, ROCH, HSDS, SPW, and, to a somewhat lesser extent, DOMD. The remaining novels are considerably less popular.
What is the cause of the other novels' relatively lesser popularity? Some might argue that it's because there have been fewer TV/film adaptations of the less popular novels, but that's a chicken and egg dilemma: are those novels less popular because fewer adaptations have been made for them, or are there fewer adaptations because the novels are less popular?
Assuming that the first is true, why haven't TV and film production companies adapted these novels more often than they have, and why have their adaptations been less successful overall?
Assuming that the second is true, then just why are the less popular Jin Yong novels less popular? Are the characters less interesting? Are the plots less interesting?