90% of EA are scam, why you need someone to buy your EA for 90$ or more when you have your perfect ea with 100% win rate? You can gain millions in 1 year
You know you can teach and EA to trade perfectly in an history EURUSD for example, so when you test the EA, using historic data, you will see the big numbers, but when u use it live, it doesn't know what to do.
There are some exeptions, ea that works, many are free, I was testing WayGrow and Hornet, they seems to work
If you want u can try it yourself