Coming back from UK - Things are so expensive in Hong Kong?

2 pints of milk - $60

Lurpak - $80

Cafe de Coral - $70

Also - everyone here, from cousins to friends are so obsessed with buying "premium" stuff like "premium milk" instead of the cheapest items, as if there is a social stigma with buying "cheap milk". I'm just so used to doing all my shopping in M&S in the UK and getting good quality and price. Slightly exhausting if truth be told.