Access to entertainment and culture is not a luxury.
lux·u·ry an inessential, desirable item which is expensive or difficult to obtain. plural noun: luxuries "luxuries like raspberry vinegar and state-of-the-art CD players"
And using price a test of luxury in a discussion about monopolies is kind of circular; it leads to saying that anything a monopoly has successfully captured is necessarily a luxury.
That gets you to prescription eyeglasses being a luxury, because I don’t need them, people can just buy contacts, and a monopoly has driven the price to astronomical levels.