Indeed, I've hired many people. The nice thing is that as an employer in most of the US, you can just fire them for any reason or none at all. I don't think the possibility of doing multiple interviews only to discover that the candidate you've had ample opportunity to question is actually a complete incompetent justifies underpaying/attempting to underpay the rest of your, presumably competent, employees. I promise you, if you stop structuring compensation with the assumption that your employees are worthless, you'll stop getting so many incompetent or recalcitrant employees.