Why won't this script take away money from players account?

Hopefully this can help you with your scripts also make sure to read little notes i have left on the script :)

first the leaderboard script

--this is the leaderboard its auto save so dont worry
local datastore = game:GetService("DataStoreService")--/                           		 \
local MyMoney = datastore:GetDataStore("MoneyData")--getting DataStoreService to store Data |
local MyRuby = datastore:GetDataStore("RubyData")--------\                                 /

game.Players.PlayerAdded:connect(function(player)
local leaderstats = Instance.new("Folder",player)
leaderstats.Name = "leaderstats"-- making a folder and naming it leaderstats to store money and Ruby in.
local Money = Instance.new("IntValue", leaderstats)
Money.Name = "Money" -- Money
local Ruby = Instance.new("IntValue", leaderstats)
Ruby.Name = "Ruby's" -- Ruby
Money.Value = MyMoney:GetAsync(player.UserId) or 0 -- player joins give his amount of saved Money or set to 0 if its tha players first time
MyMoney:SetAsync(player.UserId, Money.Value) -- setting the players data as he joins
Ruby.Value = MyRuby:GetAsync(player.UserId) or 0
MyRuby:SetAsync(player.UserId, Ruby.Value)

game.Players.PlayerRemoving:connect(function() -- playing functon when the player leaves
MyMoney:SetAsync(player.UserId, Money.Value) -- setting the players money for when he joins this is the amount he will be given
MyRuby:SetAsync(player.UserId, Ruby.Value)
end)
end)

this leaderboard has 2 values Money and Ruby they both auto save when the player leaves the game

next will be the script in ServerScriptService which is used on a function to take away the players money and give him his item or what ever you desire

game.ReplicatedStorage.Events.PurchaseStorage.OnServerEvent:Connect(function(player)-- function playing on PurchaseStorage
	print("Working!") -- print working to know if the function has been played
    if player.leaderstats.Money.Value >= 10000 then -- checks if the player has enough money
        player.leaderstats.Money.Value = player.leaderstats.Money.Value - 10000 -- if he does subtract money
print("Enough Money!") -- if has enough money print Enough Money to check if teh script is working
else if player.leaderstats.Money.Value < 9999 then
	print("Not Enough Money") -- if player doesnt have enough, it does nothing and prints "Not Enough Money"
        end
    end
end)

if youve noticed in the Buying script i removed the local variables such as local money = game.players.localplayers -- etc... and that because these can only work in a local script and you can get the Game.Players.Localplayers part from the player at the end of the fire server line after function after that you can simply put leaderstats.Money.Value

hopefully this helped you accomplish what ever you were trying to seek if you have any problems or question about the scripts or any other script just ask :)