Should there be any doctor while they fight...?

As in the "fighting arena", are doctor's presence a necessary? Any first-aid team?
Ooh just let them fight till they happily died. Since they like fighting each other so much, let them
fight and perish in the heat of bloody violence.

We could setup a food canteen, weapon shop, hotel room, spa. Ha ha, think nobody will be free to use those facilities. The main event is fighting, no audience allowed.

"Fighting arena" free for all. Go in fight fight fight.

Hopefully, at the end of all thing, peace be restored. At bare minimum, people use lesser damaging weapons to fight it out.

Make your own market

You want what, i sell what you want. There is a market, you supply their demand.
The funny thing is the reverse is also true. You go create this new demand/market, you supply too.

Weapons, people wanted weapons for defense or war. If you can supply their demand, you make billions. Could peace be bought at a cheaper price? What happen if the demand is not there?
Refer to anime Gundam Seed Destiny series, "when there is no real demand, you go create "war" aka "demand" .

Sometimes, it sounds real stupid, why men bother to use so destructive weapons to fighting each other. Why dun they just go to a certain "fighting arena", preferly a no-man's land, to fight their hearts out with basic weapons like poles n clubs, even best bare hands.