First and foremost, I like that it's a fresh take on the idea, and gets people into a different headspace compared to yet another combat focused game.
Potential: I can see this filling some otherwise dead hours, but without more substance behind the gambling core it likely won't make people play this as the main event of their evening. Which isn't a bad thing per se, but I gotta say something for this category.
Mechanics: Very simple, but spot on. A bit hard to decipher the rules text on first reading, but nothing that requires mental gymnastics. The fact that there is some information as to who might win via arena tokens is a great help and allows for some level of strategy.
Presentation: The only thing that might've made this better would've been actual artwork, but the rulebook is doing it's best to evoke the mood and the play aids are Top Tier for a Jam game. Not much to say really. It's good.
I kinda feel like some commentator quips and quotes might've been a good addition to get people into improvised narration as the matches unfold, I could see that be a lot of extra fun to be squeezed out of the premise.
Or adding paper cutout ties so you can pretend to be a rich suit working to get richer.
Theme: Uhm, yeah I kinda said all I have to say in the first few lines. I love how it puts the players into an unusual role, and I'm very sure playing this will make you feel like the hand's off yet very invested - well - Investor that you're supposed to be. I really like it.