Personally, It wont bother me not being able to leave feedback for buyers.
As mentioned, sellers often use feedback as an insurance to make sure they don't get any neg even if they are bad sellers.

People seem to be getting narked by this but I don't see why.
When a customer leaves a store, you don't see the staff calling out to others about the customer but you DO get customers saying about their opinion of the store.

I agree with this.
Many people wont leave neg feedback for a seller for fear of getting one back and this is understandable as many sellers do leave retaliatory feedback and this can spoil someones 100%.

If a customer is non paying etc then simply don't post the item and report them to e-bay.

I buy and sell and I personally like the idea of sellers not being able to leave feedback.