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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they have been charging 10% of the postage monies for many years

 

 

too many sellers were avoiding ebay fees by putting 99p as the item price and loading the actual cost into the P&P, so ebay weren't getting any money,

 

 

also they worked out they could increase their revenue without increasing the fee % so it was a win win situation for them,

 

 

this was discussed to death when it was first introduced and a lot of sellers stated they were leaving, most of them are still here!

 

 

sensible sellers increase their P&P or start price to cover this extra fee.