Also speculators serve an important purpose: hedging strategies require speculators on the other side. It is not just a "certain clientele," there are people who run profitable businesses on speculation (it amounts to collecting insurance premiums from people who want hedges).
Lots of folks gripe about how Kalshi adjudicates contracts.
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policy makers, assistants, journalists, and the like are insider trading - and the president of the united states is intentionally market manipulating for profit