While I don't mind the color at all, obviously some folks do! And maybe for that reason the Sahara has been, in the recent past, the least expensive entry into the Sniper XR line. So perhaps some folks bought their first Sniper XR's in the sand colorway due to the price, and then didn't end up liking the platform. I know one AGN buddy who just can't get along with the semi-bullpup nature of the Sniper.
The other thing, to me (current owner of multiple Sniper XR's, having bought and sold a bunch in the past as well), is the inconsistency of triggers between different guns. Some are really nice, while with others you just can't adjust them to be very good, and would likely have to polish components (something I have not yet had the huevos to attempt). The first Sniper I bought was an XR, and its trigger was fantastic. Some of my friends have bought them on my recommendation, and the triggers were lousy. And if those guns had been my introduction to the Sniper XR, I may have sold it off and never bought another.
And as for the Sonoran, just not as many of them out there (yet). I know that you won't find mine on the used market any time soon. Especially since they are coming with (at least lightly) tuned triggers.
