its simple supply and demand and yes i have had offers over $5000,
if heaps of people want it and there isnt many available the price goes up, and for $10,000 for a race import u can get an off tap rx7 that would be worked off its head, so for another say $10000 they could have it road registerd still only costing them $20,000 when a similar is available here for $30000-40000. alot of people see it as saving heaps even if they pay shitloads for the shell and vin. in the end they still get a bargin.