I have three theories.
the gods, simply gift mana, according to their whim. the gods, put manna into the earth, and being exposed to those elements, meant that humans imbibed it. Additionally, being born on a certain day, or at a certain time that was more mana rich could affect your memory capacity maybe.. (my most developed theory) Mana was the gods gift to everyone and some random people simply had a sort of "genetic mutation" that increases their amount of mana. Because one could use mana to intimidate mana-poor people, family lines were set up to breed for this increased mana mutation. Eventually the culture became so structured on mana capacity and the families that were bred for it slowly distanced themselves from those poor in mana that the communication between the two groups would diminish and the knowledge of the random occurrence of a mana-rich mutation would be forgotten. And at this point, the trade-secretes that noble families have collected to even further increase, their mana would likely mean that their bred mana-rich capacity would be more than your average mana-rich genetic mutation among the poor population. But there's no way to know because the social stratification basically weeds out the poor people with the devouring (aka the mana-rich mutation) because they will never have access to magic tools and will always die off, keeping the current noble families firmly established (and inbred).-
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