Who is going to buy the Lamborghini ? Wetsuit has done a good job by hiding his/her identity and once you walk into a Lamborghini dealership, all anonymity is gone. They will have to do a transfer of ownership and also a lot of paper work to finalize this purchase.

Will you arrange that the "winner" deal directly with the dealership and paper work and then only do the final payment when the "winner" is invoiced to do the payment?
The actual purchase process might dox either the winner or the owner of Freebitco.in.

The answer to your question is really simple no one in their right frame of mind will buy it, due to tons of expenses that accompany it. As far as the transfer of the ownership is concerned I feel Freebitco will pay the dealer directly, and it shall then be brought in winners name. In my opinion the winner should claim his price in bitcoins, otherwise hell spend huge amounts of money in customs and local taxes.
I agree the prize should be sent via BTC and let the winner decide if he/she would buy a lambo,
But I guess the winner would just keep it on crypto or buy a second hand car that isn't going to be a luxurious because of the money he/she needs for maintenance,
And also to keep the anonymity of the winner.