In my experience, and I may be wrong but
I advertise for staff at say £7.50ph or £8, I get the world and his wife apply, they apply from upto 30 miles away, they may start but seem shocked and leave when I expect them to actually work hard.
All they want is the good hourly rate.
If I advertise at say min wage or £6.50 for example I seem to actually get realistic people apply, who actually live local, and seem to actually need the job rather than just the higher hourly rate. Those people have stayed and cut it.
Again just to point out this has been my experience.