Any caller who wants a call to be backable must commit real personal capital to the same position — not just publish an opinion. No stake, no backing, no possible fee income.
A caller's economics are: their own real gain or loss on their own stake, plus a fee only when they generated real gains for backers. There is no version of this system where a bad-faith caller profits risk-free by attracting backers to a call they don't believe in. That single property is what makes "this isn't stacked against anyone" true rather than merely claimed.
The exact minimum stake (a small fixed floor, or a percentage tied to stated confidence, whichever is greater) is being tuned with real data.