I've been told that the difference between a boat and a yacht is that a yacht can carry other boats. So if that's true, the following picture is definitely a picture of a what is perhaps a very expensive yacht with some gorgeous lines.
Carrying smaller boats on a yacht makes good sense to me. It's very similar to towing smaller cars behind large motor homes. But why stop at just carrying a smaller boat onboard a yacht? If you really need to get around whether in port or on the high seas, one really needs to carry a helicopter aboard your yacht.
Both pictures were taken in Vineyard Haven, on Martha's Vineyard. Apparently some very wealthy people keep their yachts there.