I semi agree with this post, although suggestions brought up aren't necessarily the best (like what's the point to revamp the website when 99% of new playerbase is on steam).
What I think is happening is that Nabi owner(s) either isn't confident enough in his own product or is just comfortable with the size of the community that is currently present.
Concept of spending money to get money is quite a venture. Of course hiring more devs and other team members would most definitely improve quality of the game and exposure that it would get, but would it be good enough to justify the costs? That's the question that can't be answered and going into it can either be a success or a big failure depending on many factors.
Sir has already hinted in another thread that Nabi had additional paid positions in the past, but it didn't work out for them. That might be big reason why currently there's only 3 devs and pretty much no other team members to our knowledge. Even having no social media manager in a game developing company already loses a lot of potential publicity by a huge margin, but these guys are missing so much more. Besides social media absence there's also no real project manager. All improvements to the game or website come from developers themselves, which is not only the least productive way of implementing improvements, but also unnecessarily demotivating for developers themselves. There is no real motivating force pushing them to implement certain features just because they can say "oh, this would be quite tricky to do and I got easier thing to implement so I'm just gonna do those".
There are so many different "professions" that would make Toribash and Nabi more successful, but for one reason or another they have no desire to strive for bigger team, so things won't change until company changes.