Quote from Wittgenstein:
Yes, it can be vary profitable. But if you had a Bloomberg or Reuters newswire you could get the whole move - like the banks and the big traders.
... used to think that also, but found that just watching the ticker ... and trading off the move is easier than trying to decifer the unemployment report, or the oil inventory report, or the Fed transcript and then acting on the plan.
Bloomberg alerts and IB bid/ask seem to move in sync. If anything IB bid/ask reacts faster.
However, on rare occasions, there is the "head fake" move ahead of the announcement ... sometimes it leads to an investigation (Michigan sentiment release not so long ago).
my 2 cents