Firstly, there is no such thing as an unnecessary bike purchase!
The full susser is indeed an ugly bugger. As I said, only its owner could love it.
The road and cyclocross bikes got raced, but the mountain bikes are 'just for fun'. Now unfortunately my racing days are over, but I get enough pleasure and hours in riding them for enjoyment nowadays.
Long after the 'thrill of the purchase', they all get used, and never fail to raise a smile. Having ridden other bikes, I can honestly say that they do ride better, but that might just as much be down to the fit as they were all custom rather than anything else. Well built titanium does have that shock absorbing, 'magic carpet' ride that people rave about. I am sure I would get just as much enjoyment out of a smaller and cheaper quiver if I hadn't had these, but it would be hard going back now.
I do recognise that I am extremely fortunate to be able to select from a pretty special collection whatever my mood.