OK I'll start. In my opinion any change of color will devalue any car unless the job is done very well and all concealed and semi-concealed areas are painted.
It's a little like most cosmetic home improvements. For every custom change that some future buyer might like a larger number of future buyers will hate.
x2. Agreed. Besides, re-painting any vehicle other than its native color renders the owner 7 years of bad luck. Bad "car"-ma.