It sells for as little as five bucks in some markets [1] and has done so since at least 2021 [2]. Even the most expensive version is only about twice of that.

This makes it a bit difficult to estimate earnings from worldwide sales numbers. But yes, the earnings could be higher. The cost could be lower, too. It's all just speculation.

[1]: https://steamdb.info/app/1850570/

[2]: https://old.reddit.com/r/pcgaming/comments/qzj7i7/just_a_rem...