It's a proven maxim that you cannot make everyone happy all of the time. Nowhere is this more apparent than in color selection. Most people would feel ridiculous in a pink or yellow car - but of course a select demographic would love
The key to maximizing your efforts it to either maximize appeal by finding the color(s) the most number of people will buy, or else go for the niche market and specialize in catering to a specific audience.
Apple famously tried to split the difference by allowing multiple shades of their popular line of computers, the iMac (remember the Jeff Goldblum commercials? And they're doubly hilarious when slowed down to half speed, making him sound drunk!). Customization isn't always possible, however, whether it be on products or even websites, so you have to do some research into human psychology.
The great folks over at Kissmetrics have put together a fabulous infographic on how different colors affect our decision to buy or sell.