Many will be reading but afraid to comment for fear of being ostracised by the herd. They are like the iceberg under the surface.
Think about it. Those that frequent these sites and who are hardcore jw's will post all "good things" and yap on in their cult mindset. Those that aren't hardcore will be fearful of posting. But their cogs will be turning. They will grind slowly but they will grind fine.
And then they will be reminded about contributions to build new KH's... and the cogs will turn. And then their kingdom hall will close ... and the cogs will turn. Eventually some of them will wake up.