Try and sell them to people you either know would take care of them, or to someone who'd always dreamed of having one, after you've bought them, fixed them, and shined them up.
That has helped me with this problem this year.
But still always keep your favorite one.
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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd
Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive

(sold)