Well, it's usually much cheaper to use a non-Amazon 3PL to ship your Amazon volume (along with other D2C channels), but then you might not have the prime badge if you go on the cheaper side of the market.

And even if you want a prime badge, it's often/usually cheaper to go with a 3PL that can do some sort of SFP setup if you have reasonable volumes.

Although Amazon has a stranglehold on 3PL's too (or if you are a seller offering SFP), as they will force you to use Amazon Logistics at a certain % of volume if you want the prime badge which can be more expensive than other carriers.

(I work in logistics consulting and do network strategy design & 3PL selection as part of that so have a reasonably up to date view on comparative/competitive costs for this sort of thing - mostly in Europe though and appreciate the USA market is different)

Sure, but that was only several of the couple dozen fees