P.J. O'Rourke once called the Middle East's OPEC countries "bone-idle bums" and that those countries' combined non-oil exports do not equal Finland's.
Of course, it has to do with the medieval-style patronage based society, powered by oil money. Saudis won't work at entry level jobs, they expect to go straight to management. If they can't have a management job, they don't show up. A substantial fraction of the full-time residents are guest workers, mostly from Asia (mainland and offshore).
In 1976 I was in Paris and saw the A-rabs sitting in coffee houses, clipping their toenails and bullscrapping. I asked where do they work? He said they don’t. Their women do.