Some? Not a ton. https://humanlegion.com/hugo-award-sales-figures/ https://humanlegion.com/hugo-award-sales-figures/ has some data for one year. "They do have

Some? Not a ton. https://humanlegion.com/hugo-award-sales-figures/ https://humanlegion.com/hugo-award-sales-figures/ has some data for one year. "They do have an effect, but probably no more than a few thousand sales for most books, maybe over ten thousand for the luckiest, and then only in exceptional years."