Maximum cover for click & send is $100 so that is why I use registered with extra cover.

As for taking a photo of the parcel with the PO stamp I sincerely hope Paypal would not allow that as proof, it would be extremely easy to address the parcels to a friend and then photoshop the buyer's address in it's place before sending the pic to Paypal.

As far as offering express for ebay purposes is concerned if I bothered about that sort of thing I would offer platinum express with a hefty handling fee so hopefully nobody would ever use it 😉