I was thinking about this the other day. I'd like a new bike for gravity enduro type stuff, but the main thing holding me back is how much I'll get to use it, seeing as I already own two 29ers and a road bike and race them all already.
I recently sold a bike for about a quarter of what I paid for it six or seven years ago, I only used it about 5-10 times a year on average (due to using my other bikes more, but it was nice to have as a play bike). It was about 2000 pounds new. Lets say I had only used it five times in a year, that would work out to be 57 quid per ride there abouts, that's not including the maintenance costs (which weren't a lot since I didn't used it a huge amount). Using it 10 times a year would have brought the cost per ride down to about 28 quid (pounds).
I've always said you can't put a price on health and fitness and the amount of enjoyment you get from mtb etc, and while I don't want to be a bore about it, I'm not sure if I can justify another bike based on these kind of figures. On the other hand, my road bike was 1000 quid about six years ago and I imagine I use it at least 150 times a year, so that is nearly one quid per ride!
Anyone else worked this kinda thing out??