For Gumroad Day, 2021, Andrew did an experiment. He created 10 single use coupon codes for Better Letters. There were 10 codes available which allowed the buyer to get been 90% and 99% off.
It was so popular that he created a discount code for every percentage point off till 1%.
He ended up doing as much sales as he’d done in the past 3 months. He sold 120 products and earned $1048.74 in sales and described it as the best day on Gumroad ever.