Why would one want to play a game that makes them vomit?

Same reason people ride rollercoasters or race yachts.

In my experience people who vomit after rollercoasters generally avoid riding them. If the game has that effect on most people, most people will avoid it.

True, but I don't think they're saying most people will vomit playing this game. Some people just feel a little queasy, others just feel totally immersed and happy. Same as with rollercoasters.