Interesting point Blacksheep. A couple of years ago I placed an advert there for an airworthiness Engineer - ran it for 8 weeks or so without a single application. A (ludicrously expensive) 2-line ad in Flight got me about half a dozen applications, and I got another dozen via a free advert through the jobcentre (UK government placement agency). Eventually filled it through personal contacts anyway - still wonder why I bothered paying for any advertising at-all !
For the record, I was incredibly impressed with the Job Centre - I've never had the misfortune to be the other side of the counter but as an employer I thought the (free!) service was stunning.
G