They do remakes because there is no creativity or original thinking left in the movie industry, and all they care about is making money. I mean come on now, how many times has Godzilla been remade! Enough already!
True! (sadly). Most of the really good stories are now in smaller niche markets - cable TV, etc - smaller, more focused audience. However, also consider that new generations are coming of age. They don't want to watch an old fuddy movie like their parents watched. They want their own generation's version! Oh, and the producers do want to make money.