The problem was, that I had no default layout folder.
I tried getting by, using only the sw600dp and sw720dp folders. I still have no idea why they don’t work, but I don’t care. I can’t use swxxxdp <3.2 anyway, so screw that.
So if you want to write an app, that has to support phones(2.2+), 7inch tablets and 10 inch tablets, use the following oldschool stuff:
layout this is the default, it is needed even if you don’t plan to support phones!
layout-large for 7″ tablet (works on emulator and nexus7)
layout-xlarge for 10″ tablet (works on emulator and galaxytab10.1)
Other people have came to the same conclusion too.