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.