I agree that the way the information was presented made it more amenable to a risk/benefit analysis, and while there is definitely an element of that, in the grand scheme of things, it's just another factor in the decision.
Of the three traders I know personally, two are very successful. The first has one established fund, with two spin-outs on the way - in addition to a radio show, popular newsletter, cable show, private coaching etc - and is very much what I might call a commercial trader, albeit a very competent one. The second has a dizzying record, has also set up a fund, and seems to be primarily driven by altruistic motives.
I understand that both of these traders may be termed tip of the iceberg, while tens (if not hundreds) of thousands of failng traders dot that same arctic lanscape. Perhaps this is to be expected in a profession that promises the sky, and has such low barriers to entry.
Stanford MBAs on the other hand, are a much rarer breed. Even after meeting the entry requirements, potentials undergo a rigorous selection process, for which one person is accepted for every thirteen applicants. 15% of these will go on to land a position in PE/VC, straight out of the gates, and will have developed the right pedigree and connections to make it all the way. Of the remainder, a large proportion may settle for being a McKinsey consultant, which will keep many of the same doors open.
A friend of mine followed this route and is a venture associate in a Boston VC firm with $3 billion under management. The partners routinely get 8-figure performance bonuses. I've met a couple of London-based HF managers, who again, have been accustomed to 8-figure bonuses.
This is only considering relative odds of major success. There are a number of other very important issues in the overall decision (i.e. challenge, intellectual stimulation, variety, professional relationships etc), but these are much harder to quantify.