Quality, or lack thereof

Why do places with dubious standards of quality try to cover up their inadequacies by labelling or naming their brand “Quality”. For example:

• Quality deluxe paint: will start to chip off within a week
• Quality you can afford: why are you in the Everything’s A Pound shop?
• Quality Hotel: far from it
• Quality meats: a euphemism for “let’s sell the cat we found down the back of the sofa”