OK so it sounds like it does or could have some redeeming qualities that a business or professional might find useful and isn't just a chat room for kids?
I think it can be useful. While we were moving into the Miami Boat Show, we tweeted something about the move-in process and added the Miami Boat Show's hashtag. They "retweeted" our tweet and as a result, my business' twitter post went out to everyone who follows the boat show. That's great for exposures. You hashtag those that you hope will retweet in an effort to expand your reach.