Because replies to him inform people like me who don't know all the ins and outs of EU (and UK) politics and the EU economy. I've learned a LOT from these discussions, a little from what Dribbles writes, and a LOT from replies to what he writes.
And the EU posters have done an awesome job of both explaining some of the dynamics of the EU economy and EU power struggles, and also selling the benefits of why they do certain things. The US media only reports extensively on EU activities if it makes EU look bad, and so the EU posters are not only pushing back against Dribbles but they are pushing back against the entire US media.
And not surprisingly, I have learned more here from the EU posters about the way things are done in EU than from all the crap that the US media has written about them. Like the real story behind bendy bananas, for one example. I am happy that Dribbles presents much of the same crap that our own media throws at EU, and gives the EU posters a chance and motivation to present the EU point of view.
Edit: The worst part of Dribbles posting is that he makes the UK look really really bad. I have to remind myself that he does not represent all of the UK.