I'm all in favour of lively, well reasoned and stimulating debate but I really do not see the need for the confrontational challenges that sometimes take place.
Chill!
Ditto
I also have no problem providing my VIN / Reg No. if i where selling the car both are on public display anyways.
And if i where looking for a VIN/Reg to clone i could easy do a search and get the registration number then call up the selling dealer and ask for the VIN to allow me to run my own checks and its done simple as that.
I'm sure people who do stuff like that for a living have more effective ways to accomplish the task than sitting around waiting for somebody to post up the info.