There are no problems with NightSky's specs, it'll run on more or less any computer. However, there are so many more potential setups the game can run on than I can have betatesters, and I work harder than a full time employee, I'm often exausted near a game release, and to do all this properly with many more betatesters and me gathering, processing, understanding all data, fixing, sending out new test versions - then I really need that extra full time employee that I can't yet afford. That, or I can further delay everything I do.
And again, plenty of game websites tells the users to try the demo first.