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Ooops I got confused which rewards you were talking about. I have definitely been buying stones for a long time when it comes to the gladiators.

As for that toggle switch you found, that is the one that controls whether potions are used for reward chests which I was talking about but has nothing to do with opening GF gladiator.

Streamer mode is a setting for tournaments that I believe hides tournament results so streamers can show the event without spoiling the results.

All this time o could have been using those potions... Now, it is too late, as there won't be chests apparently. :D

It looks like you have it set correctly. It defaults to using your potions for the chests. If you turn the toggle switch ON, then it does NOT use your potions for the chests.