Shop ServerSided script is not working?

When I click the button to buy a sword, it doesn't say any errors or give me the sword.

script.Parent.MouseButton1Click:Connect(function()
	game.Players.PlayerAdded:Connect(function(plr)
		local RS = game:WaitForChild("ReplicatedStorage")
    local library = RS:WaitForChild("Library")
    local tool = library.ClassicSword
    if plr.leaderstats.Cash.Value >= 1 then
        print("enough")
        local clone = tool:Clone()
        clone.Parent = plr.Backpack
    elseif plr.leaderstats.Cash.Value < 1 then
        print("not enough")
    end
end)
end)

You are creating an event listener for when the Mousebutton1Click fires. Then each time that fires you create a new listener for when player joins.

I think you are trying to get something like this

local plr = game.Players.LocalPlayer

script.Parent.MouseButton1Click:Connect(function()
        local RS = game:WaitForChild("ReplicatedStorage")
    local library = RS:WaitForChild("Library")
    local tool = library.ClassicSword
    if plr.leaderstats.Cash.Value >= 1 then
        print("enough")
        local clone = tool:Clone()
        clone.Parent = plr.Backpack
    elseif plr.leaderstats.Cash.Value < 1 then
        print("not enough")
    end
end)