  An interesting mechanism for the formation of hairy black holes occurs when a
vector field, non-minimally coupled to a source term, grows from a perturbation
of the vacuum black hole, \textit{aka} vectorization. Its study has, however,
been lacking, in part due to the constant threat of ghost instabilities that
have plagued vector fields. In this work, we show evidence that, in a generic
family of extended-vector-tensor theories where the vector field is
non-minimally coupled to the model's invariant (source term), a spherically
symmetric, vectorized black hole always suffers from ghost instabilities. These
ultimately turn the process of vectorization astrophysically unviable.
