I'm sure it's all about the money, but why can't one of the classic courses be used? Do the developers of the new course put up an obscene amount of money?
K Club, Celtic Manor........
Well, quite easy: Due to the European Tour's policy the 2018 Ryder Cup venue will be somewhere in Continental Europe. While I am not sure whether too many classic courses courses in the UK and Ireland would be able to host the Ryder Cup from an infrastructure point of view, I am quite sure that none of the (few) continental ones would be able too. So this requires newer courses.
This being said I think the Spanish bid for the Ryder Cup ist the one having the least chance of winning, as Spain is the only continental European country that has hosted the Ryder Cup before. I believe Sweden would have had very good chances as it being the country that has brought the biggest number of internationally acclaimed golfers into the scene in the last 20 years. (And Spain's selection in 1999 was mostly due to Ballesteros' and Olazabal's standing in the Ryder Cup - and it's all a matter of politics here ...)
I certainly would prefer the German bid winning, getting a Ryder Cup venue built basically behind my back door
. Thomas Himmel who would be in charge of designing it, is IMO a very good architect and this could really become his masterpiece.