Not entirely, ShoesSupplier. Yes, there is a great number of ads being posted on Craigslist but sometimes the attention your ad gets would depend on how you word it. Usually ads that appeal more to the public are those that are presented in a professional way - so you have to mind your grammar, phrasing, spelling and the likes.
Whether it drives a lot or a little amount of traffic, what's great about it is that you can post for free :)
I guess, little traffic is still better than none at all...