i Would also add that not only Deustchland like Hypen domains but also France, UK and Italy.
Obviously Germany is more over the others european country. So for resale, the hypen in general devalue the price but you can still make a nice profit depending on the price. If you wanna target European market you surely have higher chances to make a profit.
If you find a domains name with hypens (1 or more) and you wanna monetize it for parking revenues, there is no devalue at all!
Just a hint, if the name have more than 1 hypens check it if it is faillisted and if it is, change your mood and buy it only if you expect to make money with zeroclick.