"The shop has been doing great. Harry Potter is just getting more and more popular," said Alsina.
There have been no new books or films -- but the "Potterverse" has in recent years expanded to include a hit video game, a play in London's West End and the "Fantastic Beasts" film franchise, while a television series is also in the works.
"Harry Potter is a fantastic engine for tourism in Scotland," said Jenni Steele, spokeswoman for tourism agency VisitScotland.
Fans of the extremely popular franchise also flock to filming destinations in England, including London and surrounding areas, the Cotswolds and York.
Devotees also tend to visit "The Making of Harry Potter" film-studio park, which has attracted 19 million visitors since it opened in 2012.
Tickets for the attraction close to London cost a minimum of £53 each and total revenues have already passed one billion dollars.
But in recent years, Pottermania has been overshadowed by Rowling's views, including her belief that biological sex is immutable. She denies being transphobic.
In Edinburgh, her views have been difficult for some.
"It's been a tough time to be a Harry Potter fan as a result of her comments, chiefly because one of the reasons why the wizarding world meant so much to so many people is because Harry was seen as being an outsider," Thorne told AFP.
"For people who really felt that, Harry Potter was a form of escapism for them, a place where they could feel accepted -- it does feel like a betrayal."
Yet the best-selling franchise continues to generate huge sales.
"Adults who grew up with it now show it to their children. It's a fandom that only gets bigger," said Alsina.
Source: AFP
