> They pay a non-decent amounts to these test takers, because they are desperate

And because the consequences are low. Anticipated shame [1] is an observed determinant in cheating frequency.

> does no one any good

It deters cheating. This does the honest test takers, e.g. those without the resources to pay "a non-decent amount" to cheat, a favor. It does employers, by being able to better trust exam results, a favor. And as a result, it does the entire economy a favor.

[1] https://s3.amazonaws.com/academia.edu.documents/46025357/bf0...