The cost of fuel is not the problem. We have unlimited uranium and thorium, and there is no reason a fusion should be cheaper. Sure its more dense then fission but fission is absurdly dense already and the economics don't improve that much.

The idea that it makes sense to use moon based He3 compared to using thorium that is already mined in waste quantities is absurd. Thorium is free energy already and the machine that turns it into energy is simpler the any fusion reactor we can come up with.