Why This Stuff Costs $2700 Trillion Per Gram - Antimatter at CERN

there are billions of tons of fish on earth. I think if billions of tons of anti mater required to destroy moon then it is not that dangerous. Billions of tons of nuke will do the job. The amount of uranium properly went fission in Hiroshima bombing was equivalent to a weight of dollar note rest of uranium were blew away without proper fission. Few grams of uranium destroyed Hiroshima why a teaspoon of antimatter destroying city is considered more terrifying??