Toyota dealers were going to send my Touareg to auction and wouldn't retail it... It has literally every feature including air ride which is hard to find and sought after. They are retailing for 19.5-21 and I couldn't get a Toyota dealer to offer me more than 14.5.
They won't give you a price based on them retailing it if they are going to send it to auction. Hence the low offer. Its just business. As everyone else has said, sell it yourself.... But theres no reason to get mad at them. Just walk on the deals.
Take your car to car max for a trade in estimate that is good for 6 days. If dealer can do better, trade in. If not, sell it to Car Max. From my past experience, dealer usually offer 20-30% less than KBB trade in number.
If your car is good shape and is Toyota or Honda. You can sell it yourself on craigslist or autotrader.