The short answer: economies of scale.
Most manufacturers who still produce the .30 Luger would rather dedicate that line to something obvious like 9mm. They sell maybe 100,000+ times more 9mm than .30 Luger and can't keep up with demand as it is. To stop and retool a line for a small run of .30 Luger every couple of months is much more expensive than making a best-selling cartridge. This cost will always be passed onto the consumer.
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