Fees are cumulative. So after a $300 and a $200 sale, another $200 sale would only pay 6%. $20,000 is a low amount for vendors on Silk Road to reach. $0-$499: 8% $500-$4,999: 6% $5,000-$9,999: 5% $10,000-$19,999: 4.5% $20,000+: 4%