Artists (of any kind) don't make any money, and don't want to waste time making money when they could be making art. So they need cheap places to live. Cheap places are cheap for a reason: there's no heating, or the roof leaks, or the kitchen isn't really a kitchen, or it's miles from anywhere you'd want to go. That doesn't matter if what you really want to do is spend every waking moment creatively and around likeminded people.
Apparently Leipzig is where the artists from Berlin are moving now, because it's cheap. But who wants to live in Leipzig? It's a nothing place.
Until 20 years from now, when it'll be a cultural centre because of all the artists there... and they'll have to move on because the rents will be rising.