Quote from bone:
Well, the simple fact of the matter is that there are precious few "locals" who make money these days. The markets are too fast and too efficient to effectively buy bids and sell offers as a core strategy.
Hi,
I have read a few of your posts on ET, so thanks for contributing

But to your point, I think just trying to buy bids and sell offers is now the realm of co-locators and computers. I agree that a human just trying to do that will end up being too slow/inefficient.
But, I think, that does not mean that there are better times to "open the shop" to buyers and sellers than others, and I think (hope) that it takes a human to decide when these times are, it's not something that can be programmed into a computer.