Sorry, that's a bullshit excuse to avoid having to pay employees.
The very blog post from this discussion explicitly touches the issue of perceived value. Everyone seeks to maximize the value that they generate from their work. That's why salary is the single most important factor in deciding whether a job is worth it's and that is why yearly bonus and salary reviews are the single most important factor in retaining employees.
Why is anyone trying to fabricate this idea that getting paid is not the single most important reason why most of us work?