The coordinator gets paid by charging fees for the use of his platform

Probably something like "I won't list your offers unless you pay 1%"

As for the oracle, I haven't thought of a funding model for the oracle yet

But while writing that I thought of this: it would make sense to me to use Chainlink. The coordinator can use part of his income to pay them a monthly fee; as long as they get paid, I don't think they would mind revealing preimage/hash pairs for the events they report results for in the ethereum ecosystem