Just found this statement on ebay.
"More safety
In 2007 those who paid with PayPal on eBay.com.au were almost four times less likely to have a dispute over their purchase than those who paid with bank deposit."
So ebay is going to have a lot less disputes if Paypal is used.
Maybe it isn't just a money grubbing exercise.
I do know that tracking bank deposits is a major pain in the posterior