[voldacar]

>If, indeed, the client is trading based on no information whatsoever, then the broker wins and the client loses.

If this were the case, wouldnt both sides just make 0$ on average over a long period of time? (or whatever the avg growth of the market was during this period)

I guess the broker would earn fees, but that still doesn't exactly sound lucrative

[amluto]

For the kind of trader that clicks on a computer all day, fees and spreads (which are not always easy to tell apart) can easily dominate price movement.