It has been said by someone else on this board, but every time I get on one of my bikes after riding the other for a week or more, I really appreciate the unique characteristics of it. Like when I have been riding my fixed gear around for a week or more and get on my road bike, I LOVE being able to go really fast (30mph +) and to spin up hills. When I get on my fixed gear I like the simplicity and fun factors (skidding, trackstands, wheelies).
Some of my friends think I have spent too much money on my bikes, but I really don't think I would be happy with anything that is a "happy medium".