I believe most people won't see the benefit of QUAD SLI. Probably just chalk it up to ego or compensation for some perceived lack of manliness.
However, what I see is a wasted opportunity to test this hardware setup in its most useful configuration: multi-monitor support, or "surround gaming".
I hope, eventually, these review sites see these opportunities to test in slightly different configurations than they may be used to in the past. For surround gaming, this setup is perfect. In fact, you only need three cards and three monitors.
The first site to do this wins extra points for insight into the direction of future gaming. Believe me, in 10 years, multi-monitor gaming will be popular. Just imagine three 24" lcds.