no such profitable EA would free for share, they will surely use it for private only. as commercial EA, it sound ridicilous for selling a profitable system, why dont they just use by themselves instead selling it at cheap bucks.
here's some words from fellow expert traders. if you're not keen to be good traders, you have to be a smart investor. and I invested my account with autotrade on myfxbook page, had a fair condition; proven track record from real account is a must, for minimum 3 months real account; drawdown limited 50% max, no martingale type trading system. and brokers has to be a decent one, not all brokers supported by their feature. i linked my Armada markets account with their system.
read their detailed faq reagarding this feature at
http://www.armadamarkets.com/myfxbook-autotrade/ you just need two step ahead for a profitable earning with your trading account.