The best next to an answer I found is here: Bibliotheken: Pornos, Nazis, Biller - Bücher auf dem Index - Nachrichten Kultur - WELT ONLINEBy the way, do you know, if books may be banned in Germany? I'm only aware of restrictions against selling them to minors. As long as they don't contain anything which is against the laws such as child pornography or Holocaust denial.
A real ban, in contrast to some "good XY should not read" lists, would mean there is no legal way to obtain a copy. So all copys are illegal. And that means no $$ for you.Hopefully the ban would never be lifted, but in the mean time everyone in the country would know about my book and would find some way to get their hands on a copy.
If my book was banned I would feel like I had done something right. I am sure lots of writers feel that way too. Banning books is silly but for some reason I've found that a lot of my favorite books have been banned.
Banned books sell pretty well actually. There is a curiosity that makes people buy the books to find out why it was banned. It is just another marketing tool as far as I am concerned.