I had no idea that there were different tiers of inoculation - how does that work? Do the cheaper ones intentionally use the wrong virus or something?

Edit: after a brief search, it appears you are mistaken about the efficacy of different measles vaccines - they are all effective.

Public health guidance contraindicates live measles vaccines in significantly immunocompromised patients.

Live measles vaccines are most commonly used in the most deeply poverty-stricken regions,

where nobody is differentiating between the immunocompromised, and the rest of the line of scared people.

PS https://www.yahoo.com/news/articles/opinion-cdc-vaccine-reve...