There is a reason why the local's without specific skills and training, lack these skills. Because as far as education is concerned, the government bears most of their cost happily. Despite this if they don't have skills and training - it's because they don't want to.

The expatriates on the other hand might be qualified for specific skills and still be ready to take general criteria jobs. Plus they are ready to work for a fraction of the cost.

You can't really blame the private firms for trying to make a profit and keep their business alive. Oh wait, they can !