Script Not Selling Item And Cloning It To The Players Backpack?

This could be the issue:Play() is suppose to play a sound unless if you are wanting it to play a sound then that is not the issue.

Hope this helps!!

I assume you're using a local script that is a descendant of StarterGui. Place the "Spaghetti" tool from ServerStorage to ReplicatedStorage because the Client (where local scripts run) cannot access ServerStorage because judging from its name, it can only be accessed by the Server. The Server is the game itself, and only normal scripts can run in the Server-side.

The reason why you place it in ReplicatedStorage is because it can be accessed both the Server and the Client.

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local gui = script.Parent.Parent.Parent
local money = ReplicatedStorage:WaitForChild("Money")
local itemToClone = ReplicatedStorage:WaitForChild("Spaghetti") -- i assume you already moved the tool in ReplicatedStorage
local player = Players.LocalPlayer
local button = script.Parent

button.MouseButton1Click:Connect(function()
    if money.Value >= 50 then
        local clonedItem = itemToClone:Clone()
        clonedItem.Parent = player.Backpack
        money.Value -= 50
        script.Click:Play()
    end
end)

But this still isn't the final asnwer..

I recommend using RemoteEvents because this script can be an advantage for hackers by changing the Money value in their client, so create a RemoteEvent inside ReplicatedStorage and name it CloneTool, and make a normal script inside ServerScriptService

Your local script in the button should look like this:

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local gui = script.Parent.Parent.Parent
local removeEvent = ReplicatedStorage:WaitForChild("CloneTool") -- i assume you already created a RemoteEvent inside ReplicatedStorage and named it "CloneTool"
local player = Players.LocalPlayer
local button = script.Parent
local clickSound = script.Click

button.MouseButton1Click:Connect(function()
    task.spawn(clickSound.Play, clickSound) -- plays the sound
    remoteEvent:FireServer()
end)

And your normal script in ServerScriptService:

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local removeEvent = ReplicatedStorage.CloneTool -- i assume you already created a RemoteEvent inside ReplicatedStorage and named it "CloneTool"
local itemToClone = ReplicatedStorage.Spaghetti -- i assume you already moved the tool in ReplicatedStorage
local money = ReplicatedStorage.Money

remoteEvent.OnServerEvent:Connect(function(player)
    if money.Value >= 50 then
        local clonedItem = itemToClone:Clone()
        clonedItem.Parent = player.Backpack
        money.Value -= 50
    end
end)

BUT THIS STILL ISN'T THE FINAL ANSWER!!

I recommend placing the Money value to each player instead because it can be changed by any player (and even the Server) if it's in ReplicatedStorage. So if you have any scripts that use ReplicatedStorage.Money YOU BETTER CHANGE THEM!

Final normal script in ServerScriptService:

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local removeEvent = ReplicatedStorage.CloneTool -- i assume you already created a RemoteEvent inside ReplicatedStorage and named it "CloneTool"
local itemToClone = ReplicatedStorage.Spaghetti -- i assume you already moved the tool in ReplicatedStorage

Players.PlayerAdded:Connect(function(player)
    local money = Instance.new("IntValue", player)
    money.Name = "Money"
end)

remoteEvent.OnServerEvent:Connect(function(player)
    if player.Money.Value >= 50 then
        local clonedItem = itemToClone:Clone()
        clonedItem.Parent = player.Backpack
        player.Money.Value -= 50
    end
end)

sorry for long answer :P

local Players = game:GetService("Players")
local gui = script.Parent.Parent.Parent
local money = game.ReplicatedStorage:WaitForChild("Money")
local itemToClone = game.ServerStorage:WaitForChild("Spaghetti")
local button = script.Parent

button.MouseButton1Click:Connect(function(plr)
    if money.Value >= 50 then
        local clonedItem = itemToClone:Clone()
        clonedItem.Parent = plr.Backpack
        money.Value -= 50
        script.Click:Play()
    end
end)

for T3_MasterGamer

local Players = game:GetService("Players").LocalPlayer
local money = Players.Money
local multiplier = game.ReplicatedStorage.Multiplier
debounce = false

script.Parent.Touched:connect(function(hit)
    if not debounce then
        debounce = true
        if(hit.Parent:FindFirstChild("Humanoid")~=nil)then
    script.Parent:Destroy()
            money.Value += 1 *  multiplier.Value
        end
        debounce = false
    end
end)