Myself, I can eat dark chocolate; but I don't really enjoy it - and since enjoyment is the only reason for eating chocolate, often I can't be bothered.
My daughter claims to like dark chocolate - but objects to being allowed to have only darks - even when this means that she gets both half of the usual, crazy, 50% dark: 50% milk & white chocolate selection - plus a share of the rest... This tells me that she does not really prefer the darks; but is merely better able to tolerate them.
I like milk and white equally, my wife only white (in other words: she doesn't like chocolate), my son only milk - so we cover the whole spectrum; but the common factor is that all those who like chocolate, like milk chocolate. And surely the most successful chocolate selection is Cadbury's Milk Tray - i.e. all milk chocolates; or Nestle's Quality Street - milk chocolates and toffees?
So why have dark chocolate at all? Partly, no doubt, due to advertisers having built-up an impression that it is 'sophisticated' to do so. Any food that lacks spontaneous appeal can become 'sophisticated' - like blue cheese, dry wine or brussel sprouts; since people must learn to like it (and children don't).
But I suspect something more sinister. After all, there seems no compelling reason to have dark chocolate at all, let alone at fifty (or more) percent of a chocolate selection (plus insidiously rippled-through or onto milk or white... yuck!). There must be something put-into it, I feel - either a toxic waste product is being got-rid-of, by making people eat it; or else some kind of mind-controlling drug is being deployed (directed at The Establishment).
I am pretty sure that a survey of people who pretend to prefer dark chocolate would reveal that they suffer from a whole raft of psychiatric, probably psychopathic, behaviours. For example, the kind of people who say they enjoy dark chocolate include Francophiles, global-warmists and similar totalitarian Satan-serving bureaucrats...
(I'm not saying that there is a one-to-one relationship; but a highly-significant correlation is surely undeniable.)
At any rate, the current program of dark chocolate propagation (especially the half-and-half rule imposed-on expensive selections) is not the kind of thing that should simply be accepted as inevitable. Protective legislation may be necessary.