There's a lot of logistical problems. The carriers are lazy OR they work very hard depending on the culture of that particular office. Management's quality varies as well. If you're in an area where the managers are only looking to check in the boxes so they can get their next promotion then you're screwed. Upper management tends to place all blame on the carriers, but its really a mixture of things.
The money is good but it's slave work. Injuries happen. Disrespect in the work place. Nobody wants you to win. 12 hours day or more. Just don't. Just don't. Unless you're a man, they get treated like stars.