It would let me protect the Earth from asteroids. In fact, for a small fee I would protect the Earth on a monthly basis, locating rocks that could be steered into the Earth and then not doing it if the cheque didn't bounce.

We could finally commodify sunlight. A large solar collector at the Earth Sun L1 would block all the light that otherwise falls on the unworthy and could be sold to those that deserve it (Litmus test is the same as with Operation Nice Planet You Have, Shame If Anything Were To Happen To It).

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