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Notes -
Why would there be californium on asteroids? You might find some plutonium from interstellar dust (although Earth is again a better source of that), but there's no process that generates californium near enough to Sol that it would actually get here before it decayed.
"On" Earth is plausibly not true, although "around Earth" definitely is. The most concentrated reservoir of antimatter in Sol System is Earth's Van Allen belts. Estimates I've seen are that you can't get the price below a billion a gram making it in particle accelerators due to inherent inefficiencies (currently it's more like trillions), while scoops in the Van Allen belts could conceivably do it for millions.
The elements that are most amenable to asteroidal extraction would be tellurium and the strongly-siderophile metals (Ru,Rh,Pd,Re,Os,Ir,Pt,Au), all of which are strongly-depleted in the crust due to tellurides and native metals (the primary forms of these elements) sinking into the core. Some of these are useful and as such humongously expensive. But, yes, there's the issue that you need to refine them on-site because of the delta-V needed for the return trip, and more generally the Space Bootstrapping Problem where a lot of space industries only make sense if there are other space industries to absorb their products.
A couple of mitigating factors I'll note:
if you were to mine asteroids with people, you would not need radiation shielding for the time on the asteroid, because you could use the asteroid itself - digging deep on asteroids is pretty easy energetically. You still need the radiation-shielded craft to get there, though, which sucks.
mass ratios look far nicer if you bite the bullet and start using nuclear. This sucks for takeoff from Earth because people will get apoplectic, but for things like a return mass driver or an orbital-transfer burn there's less of an issue there. This is getting into issues of "do you really think they're going to let Elon Musk buy a breeder reactor and reprocessing plant", though.
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