This is rather obvious because (as you already typed in the image) this is the ONLY spot in the whole game where you can get fire leaf. Everybody is farming here and if you are not brain****ed you know this spot
The place is rather crowded and the respawn is not the best so I wouldn't recommend farming here. There are better places to get herbs. There is a thread with every map in the game in this forum. Just look for it. You will get more money with the other herbs.
Btw it has only been some days with the new skin