Why won't my shop subtract money from player when buying something?

I have a shop and a buy button here for buying stuff. It gives the player the weapon but does not subtract your money.

IMPORTANT - The output says:

function start :)
Buying... :)
That costs 1000
You had 10000
You now have 9000
Tool Found

When pressing the button again it says the exact same thing

local but = script.Parent
plr = game.Players.LocalPlayer
local bag = plr:WaitForChild('Backpack')
local tool
local price
local bux


but.MouseButton1Click:Connect(function()
	print('function start :)')
	price = but.Parent.Cost.Text
	price = tonumber(price)
	tool = but.Parent.ItemName.Text
	bux = plr.leaderstats.SeerBux.Value
	if bux >= price then
		print('Buying... :)')
		print('That costs '..price)
		print('You had '..bux)
		plr.leaderstats.SeerBux.Value = plr.leaderstats.SeerBux.Value - price
		print('You now have '..bux)
		local Tool = game.ReplicatedStorage.Tool:WaitForChild(tool)
		if Tool then
			print('Tool Found :)')
			local ToolGive = Tool:Clone()
			ToolGive.Parent = bag
		else
			print('Tool Not Located :(')
		end
	else
		print('Not Enough Money :(')
		print('You Need '..price)
	end
end)