How I use 1$ FB Ads

I noticed an interesting feature of FB ads budget. I have been running several FB ads for 1$ and they almost always outperform the ads with bigger budgets such as $10-$20/ad. This is how I do it:

-For the first I narrow an audience

to 100 000

-So my ad show me a potential reach for 1$ is 1600 persons

- Then I run 100000/1600 =62,5 or 63 ads (every one for 1$)

Many of them got conversions and others I cut off. The ads run until they show results and then I increase the budget for 1$.

Does anyone else use this strategy?