I live in Turkey and my main account is with the Dutch store. I have purchased a few paid apps and loads of free ones. To buy from the store, I use prepaid card that gives you credit.
In the past I wanted to change stores but this wasn't possible since I had some credit left.
I wanted to get an app from the US store so created a second account. It was a free app for watching ABC series and downloading it was no problem. However, accessing the app could only be done from the USA but I got around that by using VPN OneClick.
In the end I found the series on Couchtuner and watching through there was a lot easier so I deleted the app. Still have the US account but never use it.