Well, I can't really argue your points on higher numbers of visitors, visitors ignoring signs, etc., but I just feel that the underlying point is that there's something "odd" or "just not right" about this ride when you consider the number of riders that go through the turnstiles each year relating to the number of incidents. I mean, if just spinning in a centrifugal manner was so potentially deadly, then RoundUps and Gravitrons would never have exisited as long as they have, right? I don't know, just a thought?
I still think that the amount of warnings (both visual and audio) they give before the ride actually make some people more nervous, causing them to get sick on a ride that otherwise might not bother them. Some people are very suggestable, and placing the thought in their mind that they might get sick (especially if they had problems with any sort of spinning ride in the past) might cause them to achieve illness. The other factor might be that people cannot see what the ride does beforehand (although it is illustrated by an animation in one of the pre-show videos), which may also play a part in someone having a reaction to this ride, where they might not have a reaction to a normal spinning ride.
Obviously, the case being discussed here is not applicable, as the death was caused by an undiagnosed condition. Which I'm not sure that anyone can really be held responsible for.