Talking about Dharma - is it worthwhile?

Discussing the Dharma, as on this site -- looking for and sharing information -- is it really beneficial or could it be a waste of time or even counterproductive? Several quotes come to mind, e.g. this one from Wumen Huikai: >The instant you speak about a thing, you miss the mark. and of course, Fen Yang: >When you are deluded and full of doubt, even a thousand books of scripture are not enough. When you have realized understanding, even one word is too much. From this and other sources (like Chogyam Trungpa's warnings about spiritual materialism) one might conclude that spending time on a site like this could be a path to illusion and a way to develop the subtle "enlightened" ego. What are the dangers of discussing Dharma on an online forum? How could it be worthwhile, if "speaking about a thing misses the mark" and "even one word is too much"?