Event tickets for galactic legends is awful mechanic. At least make it do tickets are consumed until you win. Blowing tickets on experiencing the event for the first time removes fun from the mechanic...
If they feel the need to gate progress - as if the relic requirements aren't gating enough - whatever. I get it. But they really need to change the system so the tickets "unlock" a given tier until completion. Not for one battle that rng could decide.
They could easily keep the total tickets needed in place - just change what happens in the case of failed attempts. That would keep their gating scheme in place but allow players to actually play the game and enjoy the event.