diff --git a/src/server/store.coffee b/src/server/store.coffee
index 69d8567e70..4063c4bfaa 100644
--- a/src/server/store.coffee
+++ b/src/server/store.coffee
@@ -4,11 +4,11 @@ Setup read / write access
 ###
 module.exports = (store) ->
 
-  store.writeAccess "*", "users.*.balance", -> # captures, value, next ->
+  store.writeAccess "*", "users.*.balance", (id, newBalance, next) ->
     return  unless @session and @session.userId # https://github.com/codeparty/racer/issues/37
-    next = arguments[arguments.length - 1]
+    purchasingSomethingOnClient = newBalance < this.session.req._racerModel.get("users.#{id}.balance")
     isServer = not @req.socket
-    next(isServer)
+    next(purchasingSomethingOnClient or isServer)
 
   store.writeAccess "*", "users.*.flags.ads", -> # captures, value, next ->
     return  unless @session and @session.userId # https://github.com/codeparty/racer/issues/37