Bloomin expensive to send them though, I've done it once before and it was £84 with the insurance which is a large part of it.
I've got some old Acoustic Energy Evo 3's I'm going to sell soon but their value doesn't justify posting as it'd be more than 1/2 their worth but yes you're definitely right, you see some speakers go for not much on e-bay where they won't post them.
I learned from a couple of dealers and a regular eBay trader not to bother with extra insurance. It sounds daft, but there are so many exclusions hence payouts rarely get made, and unless you photograph every stage you’ll be unable to prove what went in didn’t come out.
Get a receipt, signed for, or DPD or whatever, but just pack as if they’re going to be dropped onto the path from chest height in the back of a van, and you should be fine!
My brand new ATCs were only couriered from Stroud factory to Bath (about 30 miles) where I collected them. But one corner of one box was sufficiently bashed in to have ‘bruised’ the internal cloth the speakers were wrapped in. That packaging is used for international shipping so, it shows you can never be100%.
Conversely I sold some headphones, posted Royal Mail Signed For. Never got a signature, and RM refunded the postage and £50 basic cover. I got paid for them too! The buyer never responded to my requests to say she’d received them.