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7
Yea, because they pick up a lot of inertia while coming down.

But two problems:
1. Guidance is a bitch.
2. Getting them up there requires 1000x the energy that they end up releasing in the end because of the "you need fuel to move the fuel" problem that makes rocketry suck.

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4
Tungsten isn't that expensive, I mean, you don't build buildings out of it, but it's not precious or anything.

The major costs are the insane amount of rocket power for the ride up, and the crazy guidance system that can steer without burning the flaps off on the ride down...