CC prices in Germany are high in general (at least they are higher than prices that can be found online and in other countries)... and Frankfurt duty free isnt stellar as a general rule either (booze, electronics, etc.. are more expensive there than in other places too...)...
have you got any other layovers or you straight from BAF to Frankfurt to home?
You'd be surprised at how excellent duty free is in some smaller, less travelled airports... usually less to select from.... but for instance I can still find 2011 CC's at Entebee (Uganda) airport easily.. and can sometimes find stuff considerably older than that (picked up some 2009 stuff there last year)... The airport in Geneva had some really good finds the last time I passed through there as well... like Germany, CC's are a bit on the pricey side in Switzerland... but I picked up a 2010 box of RyJ #2's the last time I rolled through there (2012).. and there were still tons of boxes of them left on the shelves..
My favorite duty free in the world got burned to a crisp last month.. the smoke shop at the airport in Nairobi was a little small.. and had a limited selection.. but they kept their walk in a perfect 70/70 all the time.. stored their stuff really well... the clerks were knowledgeable and helpful... and probably 25% of their stock was at least 18 months to 24 months old.. like Uganda, you could still find some even older stuff there as well if you were willing to dig a little bit...
Abu Dhabi and Dubai both have excellent selections, at pretty good prices...but they turn their stock over very quickly... so its hard to find anything much older than about 8-12 months.. most of what they have on the shelves is 2013 at this point...
not that any of this helps with the Frankfurt RFI... just pointing out that all duty free isnt created equal... I used to hit anywhere from 60-80 different countries a year.. every year... for work.. these days I travel a lot less... but I still hit 6-10 different international airports each year (some of them multiple times) and have a chance to peruse their duty free shops....
a few things I picked up along the way.... Never buy electronics in London (Crazy, stupid, insanely expensive)... Never buy books anywhere in Africa (youll pay more for a book than you will an ipod).. Never buy cigars in Canada (expensive and US customs will shake you down when you return).. etc..etc..
, I look forward to seeing what is in that mind of yours.