I have always used tickets with a time limit, so far as I know there was no ticket without limit, I do not think it is an injustice, if the term is reasonable it will not affect the player.
I remember that some time ago some players played satellites of major tournaments and converted the entries into tournament dollars. they were banned from playing satellites when they had already won the ticket for the target event. I also found the right attitude, this allows more players to have access to these target games.