1. Add a donate button. Some folks probably just want to see more examples (or an example in their field, but don't have a specific paper in mind.)
2. Have a way to nominate papers to be examples. You could do this in the HN thread without any product changes. This could give good coverage of different fields and uncover weaknesses in the product.
It would be fun if the donate button let you see how many additional papers your gift would enable. I'm thinking of something like the ticker you see on the right side of a GoFundMe page, where you might see "$175 donated today, 112 papers translated, credit for 96 papers remaining"; one might choose to donate $20 rather than, say, $5, if there were a clear connection to the benefit you were providing.
1. Add a donate button. Some folks probably just want to see more examples (or an example in their field, but don't have a specific paper in mind.)
2. Have a way to nominate papers to be examples. You could do this in the HN thread without any product changes. This could give good coverage of different fields and uncover weaknesses in the product.