This is true if you're reading with the smaller kindle. I should have been clearer...
You can "read" pdf's on the kindle, but it's not preferred. But the way I saw it at the time, I could try it and if it didn't work out, then I'd buy the books in the preferred format. You'd have the same issue with adobe reader on your desktop if your screen was small enough. I'm reading on a DX and the larger screen is sufficient for all the pdfs I've tried so far.
If I want to purchase a title from the French Kindle store, I am not allowed to do so, because I am German resident. Owning a Kindle in Europe means that you are only allowed to download electronic books from your local Kindle store, but you won't get what you want to read.
All other Kindle shops are blocked.
I have a choice between Amazon.com and Amazon.de. If I choose Amazon.com, I cannot download most German books. If I opt for Amazon.de, I do not have access to many English books.
Solution 1: Buy two Kindles, one for myself (Amazon.com) and another one for my wife (Amazon.de), but then I will get confused....
Solution 2: Switch from Amazon.com to Amazon.de every few months. I would only lose my subscriptions for newspapers or weekly journals.