I understand your point and as we received feedback it's very hard to convince people to sell his proven winning system once it was already developed and running with a nice return. Another approach is to team up with someone who have a good idea that could be profitable and then start to develop together a semi-automated system from that point.
I understand this is not exactly what you are looking for, but you might want to check this guy out. I heard him speak at a local trading meeting, he seemed pretty decent to me. http://www.clayburg.com/
You are in fact asking for the holy grail. A system that can produce 100% a year in a super liquid market like you are asking, will make you richer than Bill Gates. You are asking for an exponential return. No one in their right mind would sell you such a system. A 50K account would grow to 25 million dollars in 10 years and a billion dollars in 12 years (not taking taxes into account). So you better be prepared to pay in the millions for such a system or no one will take you seriously.
Irony seems lost on you so lets spell it out: to certain individuals your request is like a big invite to rip you off. Equalizer refers to 'curve fitted systems' and 'hindsight' because it would be a relatively easy task to devise a system that would have paid way over 100% over the last 2 years, just stick the back-data in a spreadsheet and run a few hundred sims. So many people have tried this approach that it has a title...curve fitting... Very few of them are rich now because the systems only works in the past. You seem determined however to part with your cash so please let me know if you'd like a nice curve fitted system, I will sort one out for a couple of grand no probs... Why won't someone share one with you (for less than $20 million offered above)? Because they know that their edge will be eroded the more people know about it. Suppose my system is that if it rains in New York = sell the S&P for 5 ticks, and I'm getting rich on it. Now I've told you and couple of others by the time I notice my washing is getting wet you will have already pushed the future down 3 ticks with your sells, thanks to your high-tec rain sensor strategicaly positioned on the top for the empire state. My edge becomes worthless. If my trading account is $1,000,000, compounding at 100% per year, then giving you my system might cost me 7 times that over the next 3 years alone. How much are you offering again?
How does a system developer of an Emini or commodity system backtest for scalability? % of contract volume on entry? I see alot of these systems posted for trading Bonds on Futures Truth, with track records of 100% for the past 5 years or so. ATS 3200 comes to mind. I just have issues with regards to their scalability. I use % volume on entry bar as a determinant of scalability in my equity system myself.
You might ask this guy... http://www.elitetrader.com/vb/showthread.php?s=&threadid=63895 He just finished establishing his track record... http://www.elitetrader.com/vb/showthread.php?s=&threadid=68343
You can learn how to build your own. It's just a bunch of technical indicators loaded into a excel spreadsheet. And when they all are insink with each other, then the buy or sell signal goes off. Simple. Maybe somebody can recommend a book or DVD that teaches how to do this. I don't know any.
I can provide you with a system that will do far far better than 100% pa, but my wife says that I am not for sale. She put up with me for years while I learnt to trade and now is profit time.
decency never translates to an ability to take money from the markets. And, the most successful traders of all time were not decent but mandacious and full of avarice. All it really means, is that the vendor will honor his written and sometimes verbal statements upon payment. That's it! Do your own homework!