Historically, the forum always seems to be at its quietest over the weekend. You could optimistically believe that people are too busy playing Ship Simulator.
However, conversely you could turn your argument on its head and say that because there is so little coming out of Vstep these days there is nothing new to talk about because its all been said before. The only new topics posted are from new users needing a hand to get the program running (and once they do, we never hear of them again), and most of the issues have been posted and solved before if they'd only bother to search.
I also play train simulator (railworks). They release e a new version every year, there are loads of third party addons and a great variety of downloadable user missions. But, the rail sim forum is pants, it is not a patch on this one and has very little content. So if there is no one here its probably not due to lack of interest in the game.