Believe it or not, those interviews usually aren't that expensive. You probably have a mix of managers, which spend all their time in meetings anyway, and engineers, which are paid salary so they typically end up putting in a couple extra hours when they fall behind due to interviewing.

Sure it isn't free, but remember, this person had made it all the way to the end of the process. The determination was made that they represented such a large gain, for the low salary they were paying, that it was worth the risk of that small cost to get an employee at a 30% reduction in salary.

If you are going to save 30% of $140k, that means you will save $42k. It would take a lot of interviews to make up that gap.