Its a racket for sure, once your inventory gets stuck in Amazon you either have to continually pay the LT service fee increases, or you must pay for them to "destroy" your inventory.
Hilariously, they "destroy" your inventory by selling it and keeping 100% of the money.
Racket may be too strong of a word, and no I don't expect Amazon to hold inventory for free. However, charging people to "dispose" of inventory (ie. sell for their own profit) is a bit shady.
You can. For the full rate a non-Prime customer would pay for shipping. If they happen to have several units in the same place, they'll send them in the same box. My mom asked for about 2 dozen items to be returned, she received about 10 boxes, at about $5 a pop (small merchandise, retailing for $10-$20 each).
Hilariously, they "destroy" your inventory by selling it and keeping 100% of the money.