Silent praying is important but on top of that, showing your support to others often helps people cope with their difficult situations. The administrator created a "quick reply" button, so it takes just a second to do that. Imagine, if we just keep posting without replying to anybody...
By the same token, those who do not like to reply to others' requests, should have the same approach in regards to their own prayer requests, don't you think? Why post those requests here and make them known to others, if they can silently pray before God?