A waitlist signup does not validate your idea. It is a cheap signal, meaning it costs the person nothing, so it carries almost no information about whether they will actually buy. Real validation comes from costly signals, where a person spends money, time, or reputation on your thing before it fully exists. The reliable test is simple. Ask what the person had to give up to send the signal. If the answer is nothing, you have interest, not validation.
Why most early "proof" is just stated intent in a nicer outfit
Founders collect the signals that are easiest to get. Signups. Likes. A friend saying "you should build that". A poll where 80 percent click "yes I'd use this". All of it feels like progress. Almost none of it predicts a sale.
The reason is that these are cheap signals. They cost the person nothing to give. And a signal that costs nothing carries almost no information.
What is the difference between a cheap signal and a costly one?
A cheap signal is anything a person can give while losing nothing. A waitlist email. A thumbs up. A "great idea" in your DMs. A reservation that charges no card.
A costly signal is anything that takes money, time, or reputation. A pre-payment. A deposit you can actually keep. Someone switching off the tool they use today to try yours. Someone introducing you to their boss and putting their own name on it.
Only the second kind tells you anything, because the person had something to lose and chose to lose it anyway.
Why do waitlists and "would you pay" feel like validation?
Because they are pleasant and they are easy to count. A number that goes up looks like demand. But a waitlist measures curiosity, not commitment. People sign up for things they will never open. We saw this play out on Product Hunt this week, where a popular pre-launch tool sells "validation" as reservations and crowdfunding interest. A reservation with no money attached is a stated intent wearing the costume of proof.
Are surveys and friendly chats any better?
Not much. Asking someone how they would behave invites them to imagine their best self. People are generous in hypotheticals and stingy with their wallets. This is also why your friends are unreliable. They are not lying. They are answering a softer question, which is whether they still like you, not whether they would buy this.
So what actually counts as validation?
A real human, who is not your friend, doing something that costs them, before the product is finished. That is the whole definition. Money is the cleanest version, but a real deposit of time or reputation counts too. The point is the cost. Cost is what separates the people who mean it from the people who are being nice.
Key takeaways
- A waitlist signup is a cheap signal and does not validate your idea on its own.
- Cheap signals (signups, likes, "I'd pay") cost the person nothing, so they predict little.
- Costly signals (pre-payment, switching, a real introduction) cost something, so they predict a lot.
- A reservation with no money attached is stated intent, not proof.
- The test for any signal: what did the person have to give up to send it?
FAQ
Is a waitlist completely useless?
No. It is fine for building an audience and a launch list. Just do not confuse a growing list with proven demand.
How many signups equal validation?
Zero, if none of them cost anything. A hundred free signups can convert worse than three people who paid a deposit.
Does "I would definitely pay for this" count?
It counts as a feeling, not a fact. The only version that counts is the one where you asked for the card and they gave it.
What is the cheapest costly signal I can ask for?
A small real deposit, or asking the person to bring one other real buyer. Both cost something, so both mean something.
Why do my friends and family say my idea is great?
Because the question they are actually answering is whether they support you. That is lovely, and it is not market data.