Careditude is not a combination of the words care and attitude, it is a made up word that has roots with the word care. It is basically a nicer way to tell someone you can really give a rats ass about what they are talking about without really sounding like a dick.
Peter - "Not my problem."
John - "But you don't understand, I can't stop buying it."
Peter - "Not within my Sphere of Careditude, fag."