Yes, their trades are for much bigger amounts, and they also don't pay the hefty brokerage fees that casual investors like us pay. One example, http://en.wikipe

Yes, their trades are for much bigger amounts, and they also don't pay the hefty brokerage fees that casual investors like us pay. One example, http://en.wikipedia.org/wiki/Direct_access_brokers http://en.wikipedia.org/wiki/Direct_access_brokers which cost around $0.004 per share. And maybe HFTers don't even pay that much.