Quote from tomu:
Even if you are a trader only trading 1 million shares a month, 1/10th adds an extra $1,000 on to your monthly costs. And if you trade several million shares a month like a lot of traders do your monthly costs just went up several thousand dollars. 1/10th is not meaningless. There are plenty of black boxes that have an expectancy of less than 1/10th of a penny profit margin.
That's EXACTLY what I said...
This would only matter to black boxes.
Last year I traded 37,000,000 shares...
And netted slightly > $1 million...
(The record volatility more than doubled my normal margins)...
So if I got an extra 1/10 of a cent/share...
That's only $37,000...
Not enough to change a single decision I made in 2008.
Someday when I'm doing 370,000,000 shares/year AUTOMATED...
I may start to care about 1/10 cent rebates.
But the main point I'm trying to make...
Is that if you are trading manually and your margins are $0.002 or $0.003/share...
You very likely do not have a viable long term business model.
And black boxes are a great ADJUNCT to a traditional scalping operation...
But are very borderline as a standalone business model.