I would assume that if you buy at 10 dollars, and it goes to 9 dollars, then you buy some more and now your average is 9.5, so you could make a profit with very little up, if it goes to 8 then you buy same amount and now you have 8.75 average, if it goes to 7 then you buy again and you have 7.87 average, and if it goes to 6 then you buy more and have 6.93 and by the time it is 5, you buy the equal amount and you get yourself to 5.96 levels.
It means, now you own a lot more, and as soon as it hits 6 you are in profit, and even more profit than you would have otherwise because you invested more as well. If it ever goes to 12, you are now in 2x profit, instead of your 10 going to 12 with just 20% profit. Isn't that better? Never sell for a loss is not a myth, and DCA is the greatest way to use that to your advantage and make money as well. I have done it for years, it has been working great for me.
It was the same strategy I applied in one of my trades. I kept on doing DCA to a point where I was mostly out of money.
I didn't have much to invest more and do DCA and the biggest mistake was it was a futures trade.
Then the sudden market crash occurred and my trade got liquidated. I know I shouldn't have done DCA in a futures trade.
But I guess I learnt my lesson.