MF Global used to be known as Man Financial, and it had a reasonably good reputation. It did a humdrum business placing commodities trades for fund managers as well as farmers, grain dealers and others whose livelihoods depend on the vagaries of commodity prices.
All too often, the pitchmen are selling the notion that if you gain 'control' over your financial destiny - pick your own stocks and execute your own trades - it will be the first step on a short road to riches.