A quick look online shows $40k with FlightSafety. I reckon you could throw on another $5-6k for hotel, airfares and food.
The pay for your endorsement business model started enmasse (in AU) with Virgin some years ago now. It's hardly JetGo's fault to be following what many others have since adopted. They do however purport to recover the cost of the rating to the individual which in essence I suppose is a sign of goodwill.
They really should have someone proof read the ads that go to the AFAP website though. The one that went up recently is a bit of a mess.
More power to them for having a go.