As a former University Librarian and Residents Director A) Cheating happens more then it doesn't. In a Philosophy Class which had a dozen seniors all cheated in Spring Semester. Professor flunked them all by giving them an F and told them they were lucky they weren't expelled. President Graduated the students and fired the professor. Then on appeal the President was fired and the Professor rehired with a raise. B) Sh…
As someone that used to write papers for cheaters: it doesn't bother me much, because higher education is already eating itself alive in the US. The impact of a few students paying others to author papers on their behalf is nothing compared to the massive grade inflation one sees at top universities in the US.
grade inflation is real, but at least it effects everyone equally. cheating allows dishonest students to get ahead by paying $$$. moreover, you can adjust for grade inflation, but you can't adjust for cheating.