"Hop David" wrote in message
...
Wouldn't delta V expense make even a solid gold asteroid unprofitable?

Delta V does not cost money. It costs energy. Which in turn cost close to
nothing in dollars.
The issue lies designing a space vehicle with maximum deltaV per buck.
Nobody has tried that yet. All sorts of rockets have been optimized for
maximum ISP, minimum GLOW and what not. Nobody has tried to optimize for
deltaV per dollar.

-kert