Similar problems over on a watch forum I use - basically nobody covers a watch above £1000 - the only way around it is to have a business to business 'ParcelPro' account.
Personally, when shifting gear, I prefer to meet halfway or pick up item if I can. Good excuse for a weekend away. Whilst I've not had any really bad experiences with couriers they normally call when I'm out walking Sybil or when I'm firmly glued to the lavatory