I would imagine that people drive for an Amazon affiliate for a couple years with the goal of being hired by UPS for the higher pay and better benefits. The result is that Amazon will always have a lower quality of service than UPS. (I am sure HN hates UPS, but every driver I've interacted with has been super friendly, and they can sneak packages into buildings like they're ninjas. At the end of the day, you get what you pay for, and honey attracts more flies than vinegar. https://xkcd.com/357/)