Nor is the qualification devalued if some of the people that hold the qualification are cheaters. When the cheater enters the world of work he is subject to a system that will naturally weed out the unqualified. If say the cheater is employed to fix computers at an office but doesn’t know how to fix them he’ll soon be sacked.
Er, that's why it devalues the qualification. If the employer takes someone with the qualification and they suck, they'll thereafter devalue their assessment of that qualification.