Luna, all this depends on the image scale you are working with. If you go above 10,000mm with a 9"-11" scope, you will have significantly less light than say at 5000-7000mm. This will result in having the gain at 100% most of the time.
Dave works at 10,000mm and above and this is the reason for the gain being so high. unfortunately you need high focal lengths to get significant detail increases in images. You simply cannot get detail out of images that are too small and don't cover enough pixels.
Justin, yes getting scopes side by side might be instructive, but the fact that I have owned both units; the DMK I was the second to use it here and the first in Australia. I used this for 16 months at a variety of focal lengths and am very confident in my assessment. The skynyx I have owned for 3 months and have used it extensively and have seen immediate results. So in this respect I am well qualified to give my word that the skynyx is better and well worth the extra money. I cannot say it plainer than that. My images have not only improved from larger aperture but also from a better camera.