Reuniting a car with its born-with motor

[firstgenaddict]

This is how it was explained to me, figure what the car is worth without the original motor and then with it....then divide the difference in half.

For example, if the car is worth $30k as is or $50k with the original motor, the sale price of the motor should be half of $20k which is $10k.

Kurt
_________________________

I don't like the idea however by that rationale, It is then much more profitable for a person so inclined to profit to wait until the car was restored or value otherwise increased before offering the engine.
IF we use the following formula -
A backyard hack resto L78 is worth half (X/2) what a professional restoration is worth (X).
The engine block difference is the same 20% discount of selling price.
Mathematically this is half (20% of X/2) what the pro car difference in raw dollars (20% of X).
Which gives you a figure of (10% of X) split in half yields 5% of X as the negotiated price.
However waiting for the owner to expend resources to restore the vehicle stands to yield the seller 10% of X.

OR
it would be more profitable to hack resto so you could get an engine block...
either way HOLDING HOSTAGES IS WRONG.