as an additional datapoint
shop=ticket is the only one with significant usage: (15000)
https://taginfo.openstreetmap.org/search?q=ticket#values
From its definition, it could also not be suitable (unclear), or maybe it is?
https://wiki.openstreetmap.org/wiki/Tag%3Ashop%3Dticket
vending=admission_tickets also has some usage: (189)
https://taginfo.openstreetmap.org/search?q=admission#values
and rarely
ticket=admission (10 times)
Cheers,
Martin
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