No, they won't lower over time and those bearings and motors and reductions are extremely expensive for a reason. They are difficult to make.

>I also really doubt DHL just bought the robot arms with it just being a money sink, they wouldn't do it if they didn't think it would save them money.

It's probably not about saving money as much as it is about throughput. The engineers they'll have to bring on to maintain them, plus the cost in parts and power is going to cost more. Their hope is that they can take on more contracts because of this.