Buyer gets automatic full refund for "No Longer Needed" return.

Why is this even a thing? Buyer orders a $50 item. Gets it and is like "oops, I don't need it" drops it back in the mail and Amazon just processes a full refund. I even processed a partial refund before they sent it back hoping that might trigger the system to *not* process a full refund and it still does. I'm out the $7.99 it cost me to ship it. And thats even higher than the $7 that I do charge for shipping, which was refunded by Amazon.

I have this box checked "I want to offer Free Returns for none of my items", and While there is this in the refund area:

Additional refunds/charges Cost Amount to refund/charge Return shipping $5.40 Charge amount

I can't click it because Amazon already processed a full refund.

I wasted 20 minutes of my time testing the item, 20 minutes packing it, and another 15 dealing with the retesting and restocking of the item *and* am still out $13 due to the buyer not bothering to even check if the item would work for them before ordering.

Please look at order 111-7665223-5930610 and cover my costs and maybe I'll actually consider buying something on Amazon rather than just selling stuff.