Cash in the leaderstats doesn't save?

Okay so this data store script is pretty faulty:

• You're not using pcalls, in case data store service is down
• You're using GetAsync for saving data, which is only used to retrieve it
• You're not using BindToClose as well
• You're saving the data store with a non-unique key, it being just the Player.UserId(which works, however if you have multiple data stores they will overwrite data and possibly error your code)

This is how an actual data store setup would look like: (I didn't test it so tell me if something doesn't work)

local DataStoreService = game:GetService("DataStoreService")
local CashDS = DataStoreService:GetDataStore("Cash")
local RS = game:GetService("RunService")

game.Players.PlayerAdded:Connect(function(plr)
	local ls = Instance.new("Folder")
	ls.Name = "leaderstats"
	ls.Parent = plr
	local Cash = Instance.new("IntValue")
	Cash.Name = "Cash"
	Cash.Parent = ls
	Cash.Value = 0

	local data
	local g, err = pcall(function()
		data = CashDS:GetAsync("cash_"..plr.UserId)
	end)
	if not g then
		warn(err)
	else
		if data ~= nil then
			Cash.Value = data
		end
	end
	end)

game:BindToClose(function()
	if RS:IsStudio() then return end
	local plrs = game.Players:GetPlayers()
	for _, plr in pairs(plrs) do
		local data = plr.leaderstats.Cash.Value
		if plr:FindFirstChild("TagValue") then
			data -= 50
		end
		if data then
			local g, err = pcall(function()
				CashDS:UpdateAsync("cash_"..plr.UserId, function(old)
					local new = old or 0
					new = data
					return new
				end)
			end)
			if not g then
				warn(err)
			end   
		end
	end
end)

game.Players.PlayerRemoving:Connect(function(plr)
	local data = plr.leaderstats.Cash.Value
	if plr:FindFirstChild("TagValue") then
		data -= 50
	end
	if data then
		local g, err = pcall(function()
			CashDS:UpdateAsync("cash_"..plr.UserId, function(old)
				local new = old or 0
				new = data
				return new
			end)
		end)
		if not g then
			warn(err)
		end   
	end
end)

I recommend you read up on https://developer.roblox.com/en-us/articles/Data-store as well as you can ask me any questions you could have.