There are nations that can host three or more grand prix and instead to invest helping those great circuits to get restored and modified, and in this way to survive, they prefer to push this sort of things.
Jedda pays € 45 millions for each year to host the F1 gp.
In their intentions is designed to be the fastest F1 city circuit. Too bad it doesn't have run off areas and sand traps.
It could become the longest gp too if a crash happens. Formulas go in pieces when they crash, with debris everywhere. I thought they knew.
Meanwhile some amazing circuits are used only for the moto gp.