Hedging can itself be a useful service, even if the customer doesn't make money on average. Have you heard of insurance?

On Polymarket you can be the bookie and put up a yes at $0.72 and no at $0.74 if you’re confident in that 73% estimate.

In fact, Polymarket will subsidize you to do this:

https://docs.polymarket.com/market-makers/overview

https://docs.polymarket.com/market-makers/maker-rebates