PayPal fees are 2.9% + 30 cents on goods and services payments sent from US PayPal accounts and 4.4% + 30 cents from non-US PayPal accounts on goods and services payments. You are paying these fees because that is how PayPal makes their money from providing payment processing services to you to stay in operation.
eBay and PayPal are separate companies. PayPal is eBay's 'third party' payment processor.
