Depends on your locality and also what time you're going. Go to see a horror movie on opening weekend, saturday evening in a populated area and it'll be packed. If you wait till it's been out say 10 days and go during the midweek then of course it'll be less packed.
The Conjuring movies have a strong 70-30 ratio in favor of international (Non-US/Canada) box office. These movies are huge in Latin America, South & East Asia with strong showings in Europe too. The Nun II had the second biggest opening weekend for a horror movie ever in Brazil.
Slasher movies, like the recent Blumhouse Halloween trilogy are the opposite. They have a very strong domestic lean nearing 70%. It's always been the case. Slashers are particularly US friendly, supernatural is especially strong overseas.
It's culturally quite interesting. Some anecdotal accounts online have informed me that people in South-East Asia for example view movies like Halloween and Scream as 'thrillers' and not true horror. Culturally for them hauntings, demons, possessions... basically supernatural evil is what horror is.
In any case The Nun II had the third biggest opening weekend domestically for horror this year after Scream VI and only a smidge below Insidious: The Red Door. The Conjuring movies are as blockbuster as horror gets. Huge box office returns.
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