Spoken by someone who's never seen "The Sting"...Sorry to hear that someone is being scam ..... when buying from a seller for a 1st time, do buy smaller or less expensive items..... example, like accessories and etc......
See if you are satisfy with the purchase.... if everything is smooth, do put more trust on the seller and buy more expensive items.....
And what if the seller you're dealing doesn't happen to also be selling several smaller, less expensive items? Most of these scammers don't have an extensive array of items for sale on eBay at a range of prices to suit all pockets and levels of trust.
The OP already said he attempted to get this resolved by PP and failed.For the buyer, do file a report with PP and I am sure PP will able to cancel the transaction and return the money to the buyer......
But apart from all that... excellent advice!