My take is the following. If this site was a huge social media site, reactions to posts would be, perhaps, needed. However, this is very particular, members only, GIMP oriented website that people join because they like the stuff. If they like some pictures more than others, does it matter? Not really. Thousands of hits on posts is a clear sign that people are enjoying the stuff, their presence is proof enough, don't you think?
In my case, I know that people like the stuff I post, I don't care how many exactly. My interest is that people who like the movies I promote go to the store and get them. When people get one film and then another and then another, that tells me they are enjoying the films.
At the end of the day, if people keep coming for more it is because they like the shit. Period.