Selling tickets in malls and other places will require you to design your tickets, print them out, have measures in place to avoid duplication and forgery, taking in orders, cashing checks, and other cumbersome logistics that you can readily avoid by having an online tickets store.
The process of distributing them and manning the selling stations will also take a massive chunk out of your revenue while creating an account with a major online ticket selling platform like Eventbrite will take minutes. You can also opt for free online ticket selling services to further reduce your expenses.
These platforms will offer you an intuitive, yet reliable place to sell your tickets at a fraction of the cost you could use on the traditional distribution methods. You can use the extra time to iron out the finer details of your event, to make sure everything goes as planned.