That’s because creation of new coins is external to your reproduction. Eukaryotic cells are not scavenging in the wild for new mitochondria; they control the replication of mitochondria within them, including how they are passed to offspring through reproduction

An interesting thing about mitochondria too— we receive all of our mitochondria from our mother. So for every human, there is an unbroken line of direct mitochondrial ancestors leading all the way back to the first biologically unique Homo Sapian women