Pre-selling with Outseta to validate your start up idea

You've probably seen websites and landing pages for start-ups that include a form where you can sign up to receive updates on when the product launches. But as a start-up founder, nothing validates whether an idea is worth building or not better than seeing that customers will actually pull out a credit card and pay for what you're building. Outseta makes it dead simple to pre-sell products—without actually charging the customer!

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Is that ethical? Aren't we tricking potential customers here?