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

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 

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you haven't cancelled all your listings, you have several that have auto relisted,