Once you get to VA level there are a bunch of Dilithium missions - you can do "Explore Strange New Worlds", "Chart the B'Tran Cluster", and "Explore the B'Tran Cluster" simultaneously for a total of 2880 DIlithium Ore. You can also do STFs.
If the supply is boosted, the relative value will go down. If you want dil for gear, crafting, and starbases, extra supply is good. But if you want more of it to turn into C-points, increasing supply is bad.
If the amount of dilithium every person earns increases by a certain percentage, the value of each dilithium is devalued accordingly. The end result is inflation, therefore more dilitium needed for conversion.
i have to say it's just fine now.
you - cpt 34 have to get to 50, then you earn dill for every little thing you do - PVE, PVP, exploration, daily missions, dillithium mining, DOFFing, selling colonists...
on my main, i have regulary a week's dill unrefined waiting to be processed.
on another chars im just fine with doffing.