The strategy is simple.....
User signs up for myfxbook, user then creates a fake trade logs file, user then uploads said file in place of real trade data file, and then you get 734875047503475043572075% gains in one day and other such crap.
Systems that show unrealistic gains, are exactly that. They are unrealistic.... *scams*
If it looks too good to be true, it's probably a scam! Let the buyer beware.