One option doesn't involve a contract to be at every event w a rig and hospitality set up. And it costs more. And there isn't purse money.
A fellow rider told me that at the track. I haven't been able to find it in writing though and waiting for an email reply for confirmation.
BTW, World Superbike pays purse for podium finishes only. And nothing is published on how MotoGP works.
It's a shame you didn't get official credit and purse for your finishing position, but that doesn't change the fact that you did great! In my opinion anyway...