I imagine some of the stuff we used to sling in the RN was reasonably high value, but I've no idea how much! Phantom Spey engine, Russian SOSUS buoy (squillions!), etc etc.
I lifted an F1 into the Melbourne Tennis Centre for Mercedes some years ago for a promo before the Melbourne GP, probably had some value to someone. We had a practice lift earlier and the riggers caught a mirror with a strop, casual $10,000 just for the carbon fibre mirror arm
Disembarking from Eagle one of our Squadron had the doors fly open on the underslung chacon which had all the lads' baggage after a 9 month Far East pleasure cruise. Certainly a valuable load lost at sea for the owners
