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Traders try to keep their successful strategies a secret, but most strategies "work until they don't" meaning that the algos making money today are not necessarily the same ones that were making money in 2012. Furthermore, as with technology companies in general, traders and developers move around between trading firms, and the ideas move with them.

That's the whole point of Quantopian; to open-source a closed-source and highly secretive profession. See: http://blog.quantopian.com/open-source-and-trading-algorithm...

Judging by the success of a select few firms, like Renaissance Technologies (known for snatching up Putnam Fellows and top university faculty with outrageous compensation packages), it seems possible that this has already happened.

(I highly doubt they have a "fool proof" method, but clearly their method is better than others, or at least has been so far.)

Yes, a heap of firms have found these methods, they don't post them on HN :)

One would hope that most people would do that, unfortunately too few people pay attention to saving at all, let alone allocations that fit their needs/profile.