DJD
Sorry but I have to respectfuly disagree: Did you ever hear the term "no body rides for free"? If a collector has the $$ to pony up for a search to be conducted for Big dollar cars- then He/She better have the Dollars to back the cost of the search. Your theory will work for items that are currently inventoried (dealer trades New/used or common used cars) but a list of high dollar super cars - I think not.
If anyone on this board will locate an entire list of high value supercars cars at risk (your expence) please let all of us know! You will save everyone here time and frustration.