The large sizes of media are because they are for industrial use (the corn cob media I buy is originally made for "blasting", ie like sand blasting but with corn cob media). Usually these industrial sizes will last a home user/reloader quite a while (I bought my last 40 lb bag about 3 years ago and I still have a bunch left). A lot of the reloaders I know are thrifty so instead of paying $10 for 7 lbs of "reloaders brass cleaning media", they will buy 40 lbs. of industrial blasting media for $27.00. Same with crushed walnut shells; mostly used for industrial parts cleaning, polishing and it's more thrifty (aka; cheap) to buy industrial sizes...
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