Allowing each user to create their own folders could be rather complex. Perhaps it would be easier for the website (using less data per second) if everyone has fixed folders in their chest. The site knows which items are for sale at Honeydukes so it might be easier to establish an automated process in which stuff purchased at Honeydukes is being put in the Honeydukes folder in a user their chest?
Allowing each user to create their own folders could be rather complex. Perhaps it would be easier for the website (using less data per second) if everyone has fixed folders in their chest. The site knows which items are for sale at Honeydukes so it might be easier to establish an automated process in which stuff purchased at Honeydukes is being put in the Honeydukes folder in a user their chest?