So he did the math and figured he could feed them PB&J sandwiches instead of hot dogs and save the county $750,000, and he then rewarded himself for his frugalness of taxpayer funds...
My bet would be that this department is out of control based upon his actions. Once the line deputies see that command staff is getting away with this kind of behavior then they will quickly follow suit. If there is one thing I know about cops is that there are quite a few that have the attitude of entitlement. If someone is getting something they will do their best to make sure they get some too...
I'm sure the PB&J (et al) wasn't exactly quality stuff either, once he saw that he could maximize his profits this way. Inmates shouldn't get steak, but they shouldn't get blue-from-mold bologna either.