Apart from pointing out that a carrier can get nearer (you do say that percentage of sorties flown is a meaningless yardstick), and provide a more timely response, I'd say that a deployment of land based aircraft isn't without its logistical problems (AAR tankers and their costs?), even on a friendly airbase.....and a supply tail back to the UK:
Transporting vital equipment for Libya operations
Does
CDG still operate SuE as well?