A+S+T/RC+c=X
where A=age, S= sentimental value, T=time to dick around with repairs, RC=replacement cost and c=comfort.
There you go. Plug in the number and find out if fixing up that bit of camping gear is really worth it. Let's see now, I have a leaking MEC sleeping pad. A=3, S=0, T=0, RC=$100, ....
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