Is it cheaper to know?
Count the half-empty jars from your last five years. That is the only calculation that answers the question honestly.
Let us ask the question the way we would ask it about any other decision: does it pay.
The account nobody does
Open the drawer. Count what has been started and abandoned.
Most people who do this exercise find between eight and twenty containers, many of them expensive, none of them bad, and not a single one finished. This is not carelessness. It is the mechanical result of a method that consists of trying until you happen to get it right.
Add what was finished without producing anything — harder to count, because a finished product passes for a useful one. It is not necessarily so: most people finish things out of principle, not out of satisfaction.
You now have the real cost of the hypothesis.
Why this method cannot be profitable
Trying until you happen to get it right is a reasonable strategy when the space of possibilities is small and the feedback is fast. Here, neither is true.
The space is immense: thousands of references, dozens of competing logics, and a novelty every season.
The feedback is slow and ambiguous. A product takes weeks to speak, and what it says mingles with the season, with sleep, with stress, with whatever else you applied. You will almost never know, with certainty, what produced what.
A search without a reliable signal in an immense space does not converge. It circles. That is why serious, well-informed people are still searching after fifteen years.
What knowing changes in the calculation
It does not make products cheaper. It reduces the number of attempts.
That is the only variable that matters, and it is the one nobody acts on. Dividing by five the number of things you must try before finding the right one has more effect on the total than any price reduction.
There is a second effect, less obvious. A routine that is addressed to you is structurally shorter: when each thing does what it is there for, you need fewer of them. Most crowded shelves are not a sign of a taste for skincare — they are successive layers of attempts, none of which was ever removed.
The honesty of the calculation
We must say what it does not do.
It does not make good products useless; you still need them. It does not excuse you from consistency; a good direction without regularity yields nothing. And it does not produce immediate results: a correct adjustment shows itself over months, not over a week.
What it removes is the cost of searching — the exploration budget, which is invisible because it is spread over years and over dozens of small decisions, each perfectly defensible on its own.
The answer
Yes, it is cheaper. Not because knowing costs little, but because not knowing costs a great deal, over a long time, and never presents the bill.
The only point where the comparison is difficult is that a drawer full of half-empty jars does not look like an expense. It looks like a collection.