A mosaic from Aydın shows a scene of gladiatorial combat including (center) an arbiter, or referee.© Tolga İldun
Watching a bunch of guys fighting en mass and killing each other is not very interesting. You need to have an emotional connection to one or preferably both of the combatants.
I believe it was Euripedes who denedgrated gladiators who strutted about the cities, parading like gods.