Archduke Otto
Warlord
Romans sometimes used the vomitorium between each course, not just one halfway through the meal. In the nicer homes, that could mean 20 or 30 times during dinner.
They indeed vomited. But not in the Vomitorium, see Wikipedia:
A popular misconception is that the Romans made use of a room called a vomitorium for the express purpose of vomiting between meals to make room for more food. Only a very small minority of the highest classes indulged in the practice of deliberately vomiting. A vomitorium is actually an entirely unrelated architectural feature a passage situated below or behind a tier of seats in an amphitheatre, an exit through which the crowds could "spew out" at the end of a show.