I do not use Ebay here, we have an account and have listed in the past though.
As for Craigslist, we just signed up with Cargigi and so far the results have been pretty decent.
Not many leads from it yet (only 6) but over 4,500 people clicked on our ads.
Compare that to Autotrader and it blows it away.
That is 4,500 views of our vehicles, with our watermark frame including logo, number etc viewable.
If nothing else it is great for getting your name out there... and with Cargigi pricing you will be in the black with just one deal a month.