This is true. Still, for many people, intuitions against aggregation seem to stand up even if the number of people with mild ailments increases without limit (millions, billions, and beyond). For some empirical evidence, see http://eprints.lse.ac.uk/55883/1/__lse.ac.uk_storage_LIBRARY_Secondary_libfile_shared_repository_Content_Voorhoeve,%20A_How%20should%20we%20aggregate_Voorhoeve_How%20should%20we%20aggregate_2014.pdf
This is true. Still, for many people, intuitions against aggregation seem to stand up even if the number of people with mild ailments increases without limit (millions, billions, and beyond). For some empirical evidence, see http://eprints.lse.ac.uk/55883/1/__lse.ac.uk_storage_LIBRARY_Secondary_libfile_shared_repository_Content_Voorhoeve,%20A_How%20should%20we%20aggregate_Voorhoeve_How%20should%20we%20aggregate_2014.pdf