My assumptions: Paid tier users come with costs, they want support and queries solved quickly By making the cost small (2 cups of coffee a month) but not tiny

My assumptions: Paid tier users come with costs, they want support and queries solved quickly By making the cost small (2 cups of coffee a month) but not tiny they actually encourage users to use and value the service (how many free tools have you neglected over time?) They want the slightly richer customers to take their base packages as they will be more likely to buy the expensive packages in the future.