Everybody knows that the dice are loaded
Everybody rolls with their fingers crossed
Everybody knows that the war is over
Everybody knows the good guys lost
Everybody knows the fight was fixed
The poor stay poor, the rich get rich
That's how it goes
-Leonard Cohen, "Everybody Knows"
It shouldn't be a surprise that Goldman Sachs (and most other investment banks) put their proprietary traders and favored clients ahead of serving their more typical, slow money, vanilla institutional or high net-worth customers. If you think otherwise, you just have your head in the sand. When commissions get squeezed and transparency vanishes, ask yourself how the IBanks are making their profits. They are not in the business of giving money away nor even doing the right thing on a consistent basis. They are smart and they are greedy.
When you combine that with opaque financial statements and extremely sophisticated technology, you have to assume you may frequently be getting your pocket picked.