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If you're willing to pick up, clean, and re-use your brass, then it looks like your per-round price for brass is too high by a factor of 10 or more.

If you're willing to cast your own bullets, then your per-round cost for bullets is too high by about a factor of 15 (i.e., cast 9mm bullets should cost well under 1/2 cent each).

Together, these bring the cost of 9mm to about 3.5 cents per round instead of the 10.6 cents in your estimate. That means a savings (over the white box ammo) of 11.1 cents per round instead of just 4.0 cents. However, these entail somewhat more time and effort, and some amount of additional capital expense. If we estimate the expense at $300 (probably a fair amount) then you'd break even in about 9800 rounds instead of 19000+. You'll have to value your time and effort yourself :)