I was playing a supp game the other day and thought that low elo players don't place that many wards. Solution: give gold/s based on vision score. You can go even further: if vision score stagnates for more than idk 5 min, drop the scaling.
The problem is that this punishes support who are behind pretty heavily, and more importantly would be a massive buff to proplay and Ashe.
This is one-shot meta, so sometimes you can't ward, like when an assassin is lurking.
What that would end up doing is putting someone who is behind even further behind.
The issue is that you're never going to get low elo players to recognize the importance of vision. They're low elo. They only recognize the surface aspects of this game, and vision is just under that.
