I've heard/seen in car manuals not to have too much weight on your key chain, and a few people have said something like that too. I have a total of 3 keys, one is my car, one for the screen door of my house and one for the garage side door and a very light penguin key chain.
My mum and sister are good examples of a decent weighted bunch of keys, over time they've lessened the crap after me bugging them all the time. I don't understand what the issue is but seriously, I don't think you need more than 6 keys (and that's pushing it) and 8 key chains.