Glory
Step-by-step explanation:
There was no cash prize to be won at the festivals it was by default supposed to be an event approachable to everyone and free from any monetary concerns. The plays were funded by many patrons and never found shortage of money for established playwrights.
The glory of the winning playwrights was immense, known from the fact that we still know the winners of most of the years even if their plays have not survived the time.
The unparalleled glory attached to the title made writers write for the coveted title.