The pay is actually pretty decent for the skill level the job requires. I started at $14.00/hour with just a high school education and no real job skills. The reason they are so understaffed is because most people use it as a stepping stone job until they either complete school or get the job they really want. The older ones are also usually retirees who don't really need the job, so once it gets tough they quit. Couple these things with the general stressfulness of the job and that's why there is such a high attrition rate.
That would be surprising to me. Having a high attrition rate isn't the same thing has having a shortage of employees. The labor pool for a job like this should be basically endless, so if areas are ever consistently understaffed, the government must be screwing up their hiring.
~14-16 an hour for totally unskilled work is pretty damn good. I assume the govt gave benefits, right?