Not unique to Dropbox but most software. This is why I have various Apple IDs. I purchase most, if not all, of the apps via the US iTunes store with my US Apple

Not unique to Dropbox but most software. This is why I have various Apple IDs. I purchase most, if not all, of the apps via the US iTunes store with my US Apple ID, given that many devs stills use $4.99 = €4.99. I only use a non-US Apple ID to download region specific apps: banking, local TV apps, etc.