Especially with still living authors who get a percentage from my money when I buy their stuff it really makes a difference to me whether or not I object to them. And with sf/fantasy I usually end up buying what I read, because my local library doesn't have a good sf/fantasy selection in English (and I avoid reading translations if I know the original language). And well, with my very limited funds for books I'd rather they end up with someone I don't regret paying.