Closest to 50 cents and 10 cents was at around 1'600'000 installs I think (some graphs at the bottom of this comment).

Let's see how I got there, let's take their Runtime Fee rates: https://unity.com/runtime-fee

For Personal tier you start paying after 200'000 installs (threshold), whereas with the Pro tier you start paying after 1'000'000 installs (threshold).

That gives us 1'400'000 installs that we need to pay for with the Personal tier and 600'000 installs that we need to pay for with the Pro tier, for which the runtime fee will be calculated and which are above the corresponding thresholds.

For the Personal tier, which has a fixed rate, the platform costs are then:

  1'400'000 * 0.20 = 280'000 USD

For the Pro tier, with the volume discounts, the platform costs are then:

  100'000 * 0.15 = 15'000 USD
  400'000 * 0.075 = 30'000 USD
  100'000 * 0.03 = 3'000 USD
  TOTAL: 15'000 + 30'000 + 3'000 = 48'000 USD

(they're lower for emerging markets, but using the main prices here)

With 1'600'000 units sold, the overhead per a single unit then becomes:

  Personal: 280'000 / 1'600'000 = 0.175 USD
  Pro: 48'000 / 1'600'000 = 0.03 USD

If we assume that a publisher might take around 50% (just an example value in the spreadsheet I used; though in practice can be as low as 20%), then that figure becomes:

  Personal: 1/(1-0.5) * 0.175 = 0.35 USD
  Pro: 1/(1-0.5) * 0.03 = 0.06 USD

On top of that, there are also the platform fees (like Steam might take 30% of your revenue straight off the bat, other platforms might take less), so the figure then becomes:

  Personal: 1/(1-0.3) * 0.35 = 0.5 USD
  Pro: 1/(1-0.3) * 0.06 = 0.085 USD

Sanity check (doing the same in reverse):

  Personal full cost (overhead): 0.5 USD
  Personal after 30% platform cut: 0.5 - (0.3 * 0.5) = 0.5 - 0.15 = 0.35 USD
  Personal after 50% publisher cut: 0.35 - (0.5 * 0.35) = 0.35 - 0.175 = 0.175 USD
  
  Pro full cost (overhead): 0.085 USD
  Pro after 30% platform cut: 0.085 - (0.3 * 0.085) = 0.085 - 0.0255 = 0.0595 USD
  Pro after 50% publisher cut: 0.0595 - (0.5 * 0.0595) = 0.0595 - 0.02975 = 0.02975 USD (close enough to 0.03 USD)

While the exact percentages might change, Unity asking for say 0.20 USD per copy (or effectively 0.175 USD in the example, because the first 200'000 don't have the runtime fee) means that you'll need to make more gross revenue per copy than that, because your publisher and the platform will both take some of that for themselves.

Here's the graphs that I came up with, first how the total runtime fee changes based on the tier: https://blog.kronis.dev/images/1/4/-/u/n/14-unity-pricing-gr...

Also, approximately how the runtime fee overhead changes with publisher/platform fees included (with the example percentages above): https://blog.kronis.dev/images/1/6/-/f/e/16-fee-per-install-...