Retention is the key to building a great business.
When your core product experience brings your users back time and time again, you gain some incredible advantages. You spend less on acquisition, learn from your users faster, and start building a community through word of mouth and referrals.
If you can’t retain your users, you’re going to spend more on acquisition while not growing as quickly. You’ll spread distaste for your product, not delight. Soon, you’ll find that there are no more users out there to churn through.