What EV to sales is measuring
EV to sales compares a capital-structure-aware value measure with revenue. Analysts often use it when earnings-based multiples are less helpful because margins are unstable, the business is still investing heavily, or accounting adjustments make net-income comparisons noisy.
That usefulness has limits. Revenue is not cash flow, and two businesses with the same EV to sales ratio can have very different economics if margins, customer retention, capital intensity, or leverage are not similar.