My leaderstats :GetPropertyChangedSignal() doesn't work. Why?

I have a leaderboard script that inserts a folder called leaderstats. It also inserts a value called Money. I already have a "fake" money value in ServerStorage. That fake money value is actually real. So, back to the main thing here. I have a part in the script that says

 local money = game.ServerStorage.PlayerStats:FindFirstChild(player.Name)
    money:GetPropertyChangedSignal("Value"):Connect(function()
        cash.Value = money.Value
    end)

And yes, the leaderstats cash has a variable called Cash, if you were wondering. For some reason, when the money's value changes, the leaderstats cash doesn't change. Any help is appreciated. Here's the rest of the script:

game.Players.PlayerAdded:Connect(function(player)
    local leaderstats = Instance.new("Folder",player)
    leaderstats.Name = "leaderstats"
    local cash = Instance.new("NumberValue",leaderstats)
    cash.Name = "Money"

    local money = game.ServerStorage.PlayerStats:FindFirstChild(player.Name)
    money:GetPropertyChangedSignal("Value"):Connect(function()
        cash.Value = money.Value
    end)
end)

Any help is good