Those of us who stick around aren't morbid, on the basis of the bodies encountered at DLCons I'd say we're fairly well adjusted - ability to form relationships, hold down jobs, raise kids is fairly well established - so the common denomenators probably include some combination of intuition and intelligence (good for predicting deaths) and also the willingness to laugh at life's blackest moments. For me that grim humour has always been there; all the stronger from spending a lot of working time giving out (i.e. helping) others. Such friends as I've had in the medical professional etc often find the same things funny, and they're all the better at their jobs for being able to laugh at this stuff.
Oh yeah, and I like the jokes and the people I've bantered with hereabouts.