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As far as I understand, if 6 people do not join, then the money should be automatically returned...
As always if the tournament doesn't meet "the min required players". I guess for this tournament the min required players is 6.
If there is a minimum number of people, but no more than ten, then I think everyone will agree that this first game can be considered a test (if the game is this weekend).
I don't think you should complicate things... call it a test game to see how many people are serious about this series, or the show is on and that's it, with 10 players, more or less.
I don't wish to be negative, but even with freerolls (with nice prizes) before the series, we didn't have a lot of players. If people still remember some of the previous Betnomi series on the forum. So I guess that some test games will not hurt, and probably will show how many people are really interested in all this.