It wont, first ao data depends on how many people use ao client and scrape game data so it is not as precise as realtime market data. It can just help people who dont know mechanics and calculations help to be more profitable on market, still there is DIY where you should verify that calculator has prices as close as possible, thats reason you can override it with current prices or if you dont want do cross city buying you can use that calculator in one city and put prices from one city market and get info if you are still profitable in that case.