Increase in sales after advertising your game with UnityAds?

I was hoping there are people who would be willing to share their experience in regards to their game's sales/downloads numbers before and during/after advertising with Unity Ads. I understand that the minimum budget required to advertise your game is $2K, it's not like facebook where you can spend as little as you can in advertising, so before taking such a big step I would like to have an idea about what doing so can get me to (given that a game advertised is worth it).

Thanks in advance for any input!