Why do eBay charge 10% for postage that is a service which an element of that cost is insurance

[omega7a]

I don't understand why eBay charge a percentage for postage in their sellers fee's. This is a service eBay don't supply and is normally supplied by the seller 

there is also a part of the postage that goes towards tracking which is eBay policy and yet they take a profit on that. 

jusy cancelled all my items for sale in protest, I know it won't make a difference but pure greed in my view 

[red_magpie]

PLEASE not another question about why eBay charges a 10% fee on P&P costs! It's been debated to death for literally years!

Some blame a minority of sellers who evaded fees by inflating the postage charge for making it necessary. Others believe that eBay used this as an excuse to add extra fee which they do nothing to earn to the millions of items sold here.

Who's right hardly matters. It's here to stay, whether we like it or not.