  Advanced gravitational-wave observatories, such as LIGO and Virgo, will
detect hundreds of gravitational waves emitted by binary black holes in the
next few years. The collection of detected sources is expected to have certain
properties. It is expected that a selection bias will exist toward higher mass
systems, that most events will be oriented with their angular momentum pointing
to or away from Earth, and that quiet events will be much more numerous than
loud events. In this paper we show how all these assumptions are only true for
existing detectors and do not have any universality. Using an network of
proposed third-generation gravitational wave detectors, we show how each of
these assumptions must be revised and we discuss several consequences on the
characterization of the sources.
