eBay seems to employ an outrageously imbalanced po...

eBay seems to employ an outrageously imbalanced policy regarding transaction disputes where, regardless of the situation, they will universally favour the buyer over the seller.

Case in point: Buyer x pays for a second-class postage and I send the item the following day as a second-class parcel, along with multiple other parcels. All of these other parcels arrive on time and I thereby receive positive feedback. However, x decides to go on holiday on the day his parcel is scheduled to arrive. Unsurprisingly, x doesn't receive the item. Now, rather than visit his local sorting office to collect the parcel that's almost certainly waiting for him there, x issues a complaint against me on the grounds that the item hasn't arrived and tracking hasn't been provided. I try to explain that second-class parcels are not trackable, that I have a proof of postage, and that I've completed a P58 form with the Royal Mail in case it's been lost. eBay still favours the buyer and grants a full refund, deducting the price of postage and the item from my account.

Where is your seller protection?