Sold my '03 BMW 525i on Ebay last year (also listed it on autotrader). It took me two auctions to sell it. During the same time period, I received only one or two calls from people who saw it listed on autotrader. Maybe different parts of the country are different. Just include plenty of pics!
It seems like you asked this question previously--a few weeks ago. Have you been have any second thoughts? I don't drive my that much either (averaging 5k per year) but I'm not sure I could give it up at this point plus I would not want to loose that much money on the car--i figure after owning the car for a couple of years, the rate of depreciation starts to slow down and it's not loosing value as quickly and is therefore easier to justify.