I seem to remember that not too long ago VirtualAcorn celebrated 3000 sales. I also recall that Castle had a target of 500 Iyonix sales to be achieved 'by the Christmas of the launch year'. Given that in both surveys the number of Iyonix and VRPC users is similar, that suggests the true level of Iyonix sales is around 5x higher than the number suggested, and that the number of RO users is approx. 10,000, which seems a more reasonable sort of figure to me. As to the RPC's dominance, that suggests that many RO users are simply hobbyists, and have invested in other, up to date equipment for their serious computing. If so, it is indeed a matter for concern.