Comment by shagie

Sunk cost. You've spent... 20 to 100 hours on interviews. Maybe more. Doing it again is another expense.

Onboarding. Even with good employees, it can take a few months to get the flow of the organization, understanding the code base, and understanding the domain. Maybe a bit of technology shift too. Firing a person who doesn't appear to be preforming in the first week or two or three would be churning through that too fast.

Provisional hiring with "maybe we'll hire you after you move here and work for us for a month" is a non-starter for many candidates.

At my current job and the job previous it took two or three weeks to get things fully set up. Be it equipment, provisioning permissions, accounts, training (the retail company I worked at from '10 to '14 - they sent every new hire out to a retail store to learn about how the store runs (to get a better idea of how to build things for them and support their processes).

... and not every company pays Big Tech compensation. Sometimes it's "this is the only person who didn't say «I've got an offer with someone else that pays 50% more»". Sometimes a warm body that you can delegate QA testing and pager duty to (rather than software development tasks) is still a warm body.