It was, but as the economy of conquered territories had collapsed (there was little to buy, and people couldn't afford anything), it was of little consequence.
And after the war, the "natives" were going to bear the costs of it - and that was of no concern for the Germans. Actually, it was desirable to keep them poor; they were going to be a reservoir of unskilled workforce for Germany and nothing else.
The selection provided Germany with, badly needed skilled and unskilled workers - the process wasn't maybe highly efficient, but actually, the process of recruiting forced laborers wasn't highly efficient either.
In the end it was good enough.