Other than sheer luck, the most plausible explanation for your diminishing returns is that you found a strategy that worked _at that point in time_, other people copied it (starting with your broking firm), and as that strategy became more common your ability to make money disappeared.
I work in the industry, this happens all the time. Trading strategies have a shorter half life than you may think.
A lot of people in the business would pay e.g. $5,000 for exclusive rights for something that worked this well in 2009 (with proof that it worked in 2009, e.g. verifiable broker statements), and a smaller amount (say, $5,00) for non exclusive rights.
If he claimed it still works but he wants to sell it, it is a completely different game -- because when these things work, they are cash cows.
The guys you want to work for (2sigma, RenTec, Jane Street, Susquehanna, ...) are unlikely to call you up as a result of this blog post / hacker news exposure/discussion.
If you want to go back to trading, you'll probably have to actively try to get a job -- at the very least, let someone who's still in the business know that you are looking. In my experience in this field, word of mouth and friends-of-friends are infinitely more successful hiring strategies, for both sides.
(Re:releasing the source - I would like to have a look at the strategy, but I would recommend against releasing anything that is even close to being useful, unless you want to spend the next year screening "where can I get a good XTAPI broker" and "I've got XTrader_PRO set up, but I'm getting error 10013, what gives?" emails).
the Nuclear Phynance message board is probably a better place to look for business offers.
