36 Winning rate 70% but capital decreases EA's true nature
Introduction
When you look at EA sales pages,
you often see phrases like
“Winning rate 70%”
“Winning rate 80%”
and so on.Indeed, at a glance, the numbers are appealing.
However in reality,
an EA with a 70% win rate can still reduce funds.
Why is that?
Because the essence of trading is not the win rate.
High win rate alone does not determine profit
For example,
let’s say you make 100 trades.
Win 70 times.
Lose 30 times.
Just looking at this seems excellent.
However,
profit is 10 pips.
loss is 100 pips.
What would that be like?
If you calculate,
70 × 10 = 700
30 × 100 = 3000
The result is,
−2300 pips.
In other words,
even with a 70% win rate you can still lose.
Idea of expectancy
In EA, expectancy is important.
What expectancy means is,
on average over the long term,
how much profit remains per trade.
The formula is simple.
Expectancy
＝
Win rate × Average profit
−
Loss rate × Average loss
.
If this is positive,
profit accumulates over the long term.
If negative,
no matter how high the win rate is, you head toward ruin.
Trap of high-win-rate EAs
High-win-rate EAs have a characteristic.
Small, steady wins.
But,
they tolerate a big loss once.
Profits stay small.
Losses become huge.
This is very dangerous.
Nuppin (averaging down).
Martingale.
Grid.
Many high-win-rate EAs have this structure.
Indicators worth looking at
What you should really look at is not
the win rate.
What matters is
・PF
・DD
・Average profit
・Average loss
・Risk-reward
・ expectancy
.
The win rate is a supplementary metric.
It is not the core.
From a MAEP perspective
AI also tends to emphasize win rates.
Because it is easy to understand as a number.
But trading is statistics.
What matters is not
how many times you win.
Whether your funds increase in the end.
✅ Summary
Win rate 70%.
It looks attractive.
But if the profit structure is poor, you will lose.
When evaluating EAs,
more than win rate, look at expectancy.
That is the baseline.