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Let's say orks ally with a traitor planet which the imperium is going to invade. Traitors hire some orks to ally with them, but what incentives or pay would the traitors be able to pay the orks?

Guns, or simply the promise of a good fight...

Guns, vehicles, technology, bullets, shiny pieces of metal, not shiny pieces of scrap - hell, even the promise of a fight after this fight might be enough, according to DoW II: Retribution.

Bribing orks is easy. Convincing them to not turn on you shortly after payment is less so.

Good lootin'? A right propa fight? The ability to show those humies who's boss?
Orks don't particularly like chaos because of their human ties and oppositions of Gods in the warp, however chaos humans are far more Orky than Spes murines.