Came across this pretty far out idea that PayPal at one point in there painful history decided to create demand for there service by unleashing a series of bots on eBay to go and buy up items and demand the seller accepted you guessed it PayPal as the payment method. Now this might sound a little crazy, but lets be honest here has PayPal ever played by the normal rules? I would guess this was way back before eBay bought up PayPal, prob in the BidPay era which was the preferred processor on eBay at one point. I will try and find more on this.
Sources : http://redd.it/1ry77s
The PayPal wars book this is in (Amazon link)