Must be a typo, some of the others are 75K, yet the Monza one is also 5K.
The race is broken anyway. Dumb AI pits twice on that race, I did a no stop in the Lexus and was half a lap ahead at the finish
I'm kinda gutted custom races have such bad payouts. Max 120K for 4 hour endurance race. For some reason it scales down with more laps or time. 4 x 1 hour races adds up to almost 3x as much as 1 x 4 hour race.
The game economy is upside down. The shorter the race the higher the payout. 40K for a drag strip even that's done in 12 seconds lol, (To be fair, to buy and tune a car to clear that event sets you back a whole lot more...)