Yup, definitely, I should have made that more clear than it was (I did mention "after discounting for the cost of the test", but it wasn't as obvious as it should have been). Test costs have to be weighed against benefits, but that whole process involves a lot more statistical sophistication than is typically applied in practiced medicine. Researchers are slightly better, though it's fairly common even for them to make hideous statistical mistakes, which is a real problem in the field.

IMO, if pre-med requirements included a bit more statistics and a bit less biology, we'd all be better off...