It is about balance, surely. I can get off on a very straight bass line on the occasional tune but, all night? No chance. Some of it is personality; I just cannot do the straight eighths thing all night and stay interested in the gig. I could do it for one gig or a couple maybe but, after that, I would loose my enthusiasm for the music being played and, eventually, walk away. Yes, of course it is about the song but, if all of the songs 'require' that kind of bass line, I am going to quickly come to dislike the lack of contrast in the songs as much as I do the lack of interest in the basslines !!!