humble minion
Legend
It's a fine distinction, but they were setting questions, not setting book questions (I wrote in Al-Qadim, for what it's worth...)I got setting book questions, like pick your 3 favourite settings and it asked me which settings I bought (all of them).
The questions about actual products had three categories - core rulebooks, adventures, and 'supplementary rulebooks'. And whenever they listed examples of 'supplementary rulebooks', campaign settings were never among them.
(And seriously, in this schema what category does Spelljammer fall under anyway?)