I think there is no difference if you sold big amount or small amount , because the fee doesn't change according to the amount you sell . For example : if you sold 1 BTC , the fee is 0.002BTC , and if you sold 0.1BTC ten times , the fee won't change .
yes fees doesn't change according to amount user sells but there are some exchanges that gives discount to users on trading fees based on their past trading volume.
So basically isn't trading volume the same as sold/bought bitcoins amount combined? But these lowered fees are so insignificant that barely anyone can achieve it.
See Poloniex's fees table:
Maker Taker Trade Volume (trailing 30 day avg)
0.15% 0.25% < 600 BTC
0.14% 0.24% ≥ 600 BTC
0.12% 0.22% ≥ 1,200 BTC
0.10% 0.20% ≥ 2,400 BTC
0.08% 0.16% ≥ 6,000 BTC
0.05% 0.14% ≥ 12,000 BTC
0.02% 0.12% ≥ 18,000 BTC
0.00% 0.10% ≥ 24,000 BTC
Have fun trading with 24k BTC.