Why does my ROAS drop every single time I scale spend?
This is math, not bad luck, research shows a 1% increase in spend at higher thresholds often yields only a 0.29% increase in revenue, so your marginal ROAS on the next rupee is always lower than your blended ROAS. Your first Rs 1 lakh in spend might return 5x, but the next Rs 1 lakh on top of it will likely return meaningfully less as you exhaust your highest-intent audience. Judge scaling decisions on incremental (marginal) ROAS, not your blended average, or you'll keep being surprised.
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Puts real numbers on the marginal-ROAS problem, showing exactly how the 'second dollar' of ad spend returns less than the first, the single most important mental model for scaling decisions.
A clear-eyed walk through the exact tension in the question, more spend versus intact margins, with practical pacing rules rather than vague 'scale carefully' advice.
Written for the stage most 'scaling' content skips, brands already past six figures a month trying to get past seven, useful once you've outgrown beginner scaling advice.
Ties scaling decisions explicitly back to profit margin rather than just ROAS, a useful corrective for founders chasing a vanity ROAS number while their actual margin quietly erodes.
