[dzamie]

On the face, maybe, but if they qualify and they're desperate, they'll agree to a lower salary and be less likely to seek out a competitor to work at.

In contrast, someone who doesn't feel pressured to take this job or else will seek a more competitive pay, and maybe leave for another job if they're dissatisfied.

[kortilla]

The desperate candidate that you underpay will lose the desperation after getting the job, realize they are getting ripped off, and leave much quicker than someone compensated at the market rate.