I realise what your saying but it gives you a way to trace the vendor. You would be surprised how little bits of information can turn up people.
In my work we regularly come up against false plates, hire cars and the like to throw spanners in the works but every little bit turns up information and you get a bigger picture after a while.
I bought a humber a while back in Scotland and the owner wasn't prepared to bring the boat over to the mainland until the cash was in his account. I was instantly wary about this but he sent me photos of the particular items I wanted each night after I asked.
He was using a home email account to sell the boat and I got his full name. Quick call to directory enquiries and a national search later I had his home address and phone number. I then googled his name and he was the owner of a engineering company too close to the home address to be a co-incidence. I rang the company, asked to speak to him and carried on our conversation as if it wasn't usual ringing him at work.
Home phone number
Work phone number
All from a little bit of digging.
Once I got that sussed I wired him £8.5K and met him in Inverness to collect. Mind you I was still worrying the boat would be alright!