Via The Guardian:
The in-house engineer at the venue invariably knows the room and sound desk better than the guy you’re paying £100 a day to drink your rider. No offence to travelling engineers, but anyone who would rather sit in a van all day for less money than they’d get for showing up to a static venue at 6pm is a sociopath. You can occasionally find an engineer who offers value for money by driving your van as well. These people should be avoided at all costs. You do not want to be sleeping next to someone like this.