Hello!
I don’t know if [Satteldach-Gaube] is the official term ([Zwerchgiebel]??), but one can assume that this shape is not only prettier but also significantly more expensive than, for example, a dormer with a shed roof.
Furthermore, only "small dormers" are possible in this shape – and 2 small dormers cost almost twice as much as one large one. The improvement in the interior space with such a small dormer is rather marginal as well.
Despite everything: They are pretty, though!
Regards,
Tom.