Why do selling EAs stop winning after a few months

Introduction

The EA was profitable at the time of sale.

But it stops after six months.

Disappears after a year.

EA like this are not rare.

Why does this happen?

Market Changes

The market is not fixed.

Trends change.

Ranges change.

Participants change.

Volatility changes too.

In other words,

the environment that the EA assumed has vanished.

Past Optimization

Many selling EAs have

very clean backtests.

However,

they may be overfitted to the past.

Over-optimizing makes them weak in the future.

This is the most difficult problem in EA development.

Lack of Maintenance

The market evolves.

Therefore EAs must evolve as well.

However,

there are many EAs that are not updated after sale.

As a result,

their performance gradually deteriorates.

What Makes a Great EA Developer

A great EA developer does not just sell and stop.

They continuously improve.

They analyze the environment.

They monitor performance.

They nurture the EA.

This is where the difference lies.

MAEP Perspective

An EA is not a product.

It is a financial system.

A system survives only when it is maintained.

✅ Summary

Reasons why a selling EA collapses.

It's not that the market is bad.

It's that it is not designed with the assumption that the market will change.