And some historic sites are even restricted to 40. Some natural history associations buy up a number of cabins. The remaining places are given to tour operators. Different areas of interest can cause tension when thrown together. Ask to see the synopsis of a lecture.
Lectures are much more interesting when the presenter is a gifted speaker.
But all too often, it seems that famous scientists have great difficulty getting their message across to the public at large. Helicopters on board give the trip an added dimension. They are able to land anywhere so that people can visited areas that are inaccessible with the Zodiac. Helicopters can also be used for reconnaissance purposes, seeking out the easiest path through the pack-ice and restricting travelling time . If so, that gives you the reassurance that the trip to Antarctica will not cause any damage to the environment.