If it is a scam why would anybody want GPU rigs anyway. Other than to make a very cheap GPU supercomputer, which is actually very useful in academia [http://www.youtube.com/watch?v=hSVo4ejZ7rc], I just do not see the point.

It would be easier to ask bitcoin miner to simply ship their rigs (shipping could be paid by the interested party) to be recycle for such purpose rather than trying to justify it for bitcoin GPU mining.

Anyway, each its own.