But this opens up the possibility for all kind of frauds. Think about it: they can make deliberately use of that to generate income for themselves, ie. committing fraud...
Does the NBBO play no role anymore?
In another thread here I read about TOS' flat rate commission, ie. "true" flatrate.
I'll take a closer look at this.
I remember also another active trader here (Neke) in his journal here showed that he in the last 5 years or so made no significant profits, but paid more than $300k in commission, ie. only his broker has profited from his trading... Commission sums up gigantically, so one should be careful...