QUOTE(Art @ May 10 2008, 10:26 AM)

I find paypal to be extremely convenient. There are a number of companies that I use online that accept direct paypal payments. Very easy.
The convenience notwithstanding, the issue is anti-competition and interference with commerce and private contracts. Time after time, eBay continues to claim that they are
only a venue and that the auctions/BINs are contracts. This is very important because, at least here in the States, this partially indemnifies eBay if/when a deal goes awry. However, if eBay were to try to force "PayPal only" in the States, they may very well then become a party to the contract. As such, they would no longer indemnified as a "venue only", but now will hold liability as a party to the contract.
eBay already has some liability due to its interference with the legal contract between the buyer and seller because it excludes the use of certain competitors of PayPal. However, other forms of payment options are available to the seller to offer the buyer in the contract. Take away those options and eBay may very well violate some State anti-trust laws. Remember, here in the States, PayPal must be a registered financial institute and falls under some very specific regulations in many States.
I see what eBay is purporting to do in Australia as simply testing the waters. I believe they want to see public reaction to an actual implementation, just to see if the "public outcry" will really have any affect. Here in the States, individuals would have to actually file complaints with the appropriate regulators and authorities before something "bad" would happen if they tried the PayPal only scheme. If they test the waters in other countries first and see what kind of reaction is obtained as opposed to the "outcry", they may actually be stupid enough to try it here in the States.
eBay is starting to do a lot of stupid things recently, including their lawsuits against Craig's List and the one in Germany with Skype's (an eBay company) lawsuit contesting the GNU Public License as violating anti-trust laws. eBay's lawyers really do not come off to me as the brightest bulbs on the block, and I am seeing what I personally believe to be some rather irrational and harmful actions this past year.