That UI is excellent, but it doesn't explain why it should be quadratic and not linear. At first glance, it seems actively bad, as I'm penalised for focusing on

That UI is excellent, but it doesn't explain why it should be quadratic and not linear. At first glance, it seems actively bad, as I'm penalised for focusing on just a few issues! Unfortunately the linked article is paywalled. The motivating example in the QV papers I've just skimmed is more about people voting on a sequence of yes-or-no questions, buying some number of votes and being compensated afterwards each time. That's totally different from this one-shot, multiple-questions, fixed-budget example.