1) Everybody loves echelons.
2) Everybody likes it when a team with a guy in the top 10 actually try to advance rather than ride conservatively.
3) Everyboy likes it when some opportunist makes fools of the sprinters right at the end.
Also, finally, this year TGBM goes from being the talented rider who places strongly but never actually wins anything to a guy with some decent wins on his palmares. I doubt if anyone imagined that his first GT stage victory would come on a sprint stage, mind you.
There's no real Sprint train or top flight sprinter at this Vuelta. If a Greipel, Cav, Sagan, Kittel, Degenkolb or even someone like Viviani was here then a team would be motivated to do the donkey work and keep it together for a bunch sprint. As it is Eddy Bos is probably the best Sprinter in the field and Sky won't work for him until Madrid simply because he's not the Manx Express.