Quote from goldenarm:
You don't get rebates from the dark pools, but there are special ECN routing algorithms that enable you to piggy back off the dark pools and make fractions of a cent better than the inside market. ECN rebates make your transaction costs next to nothing so you can benefit from this type of low risk trading. I haven't taken the training class but there are many profitable traders that use these methods at WTS. This type of trading is pretty boring to me since you have to work with penny stocks all day long so I'm not really into it.
Would like to know more about this.