why do I have to pay to play
You don’t have to pay. You will get free sponsorship time (30 mins) every 4-5hrs. The reason you are paying is because at some point you clicked the auto buy sponsorship ON which buys the sponsor time when it is waiting for the next free one.
To turn it off go to the coin room selection page, click on green sponsor bar at bottom of page, click on sponsor preferences at top of page, turn both options OFF