U.S Comics and death...

I was wondering if its just me or does the Comic industry in the US have such a hard time KILLING their main characters and ending a comic series? Unlike Japan when they would say "Ok this is the final volume nothing more", Marvel and DC would like to lead you that A died but then make 3 more new series retelling A again.

How about Jonny the Homicidal Maniac, have any of you ever read that little comic, its the beast thing EVER. more blood and gore then santa trying to give presents to a homicidal goth....wait....I think that actually happens in the book......