Oh now, that's a question far too difficult to answer with any precision.
I dunno how many people in the United States are riding the disability gravy train, but if, say for example, one in twenty of the general population are, it's a pretty good bet that ten in twenty primitives are.
How many are legitimate cases of really can't work?
If, say for example, one in three of the general population riding the gravy train are, it's a pretty good bet that one in thirty primitives are.