Seven euros, ouch!!!
I wish I'd warned you. When I've gone on about AZERTY before, I'd sort of taken it for granted that people realized how different these things were; I hadn't realized myself that in fact in Roman characters there are essentially two types of keyboard.
Because you're right in part, Petra, some of the differences are based on letter frequency in the language. And others, presumably like your own keyboard, arise from the need for é, ç, ö and the like.
Even from one make to another, there are changes. On the French keyboard at work, hingyfan, that blasted @ is not only near the top right, but requires an "alt" to get it!!
I much prefer having the accents to hand, though. Before that, I had to remember a host of abstruse combinations with the number pad.
The morning I told them, after a bout of RSI, that I was walking out that instant if they failed to give me the French keyboard, wicked tongues said that the only reason I wanted one was to write trade union tracts...