Paying customers provide more valuable feedback than free users because financial investment creates accountability
Free users will consume your product and ghost you when something breaks. Paying customers (even at discounted LTD prices) are financially invested and will provide brutal, specific feedback about what's broken. They tell you exactly what needs to be fixed rather than silently churning. This is especially true for lifetime deal customers who paid upfront - they're motivated to see the product improve since they can't get refunds.
When to use
During early product development when you need honest, detailed feedback about product gaps. Charge anything (even $10) rather than going free to ensure users are invested enough to give real feedback.
Don't do this
Relying on free beta users or friends who won't give critical feedback. Free users optimize for being polite, not being helpful. You end up with vague praise instead of specific bug reports and feature requests.
2 Founders Who Did This
250+ LTD customers who paid $79-$299 gave 'very brutal feedback' through Intercom and direct contact. About 20-25 active users provided weekly insights that shaped the entire roadmap. Contrast with his statement: 'Free users don't actually validate your product. They will just consume it and if something doesn't work, they will just ghost you.'
Set threshold of 10 paying customers from outside his network who actually used the product. Dismissed friend/supporter purchases as validation.