Hmmmmmm. Low-tech = 1/5 of the plants you can grow using high-tech? That sounds awfully low, lower than I would have thought. Not that I have taken any scientific study about this, but my gut feeling is that you're not being completely fair to the low-tech approach. Remember, there are different kinds of low-tech setups. I think someone trying to grow plants in sand (or worse, plain gravel) with 1.5 wpg will have much less luck than someone trying to grow plants in soil + gravel with 2.5 wpg. I think that there wouldn't be a huge number of plants that the latter person wouldn't be able to grow. But, as I said, I don't have any real figures to dispute Simpte's claim.
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