I have never been much of a fan of Craig's List, but I know some folks have done pretty well there. It seems there is a lot of garbage on that website that it is not worth my time to sift through it.
I figure, if someone is serious enough to sell a $50K boat, they would advertise it properly. But, again, thats just my opinion, and if you like Craig's List; then by all means, use it.
I was never much of a fan of craig'slist either, but recently I have been browsing, and have seen adds placed on there from about a half dozen local dealers,marina's and broker's, trying to sell everything from boats , to parts, to boat slips. Apparently they must feel they get additional local exposure by posting there. I think they are right.