[Build: 0.8.20] As far as i tried you only need to buy one ticket once to endlesly enter the Khorm. Arena while stated otherwise at the vendor.

[Papum]

As the title suggests.

 

[Papum]

Tested it and you don't need to buy any ticket to enter any arena competitor event, even for the first time.
And when bought it is not consumed when entering the event.

Build: 0.8.20