Shaun, Yell.com the last couple of years has been really borderline for me, thing is though, you tend to get more com. Jobs From it, I'm paying £480 a year (I think) but last year I know I got one com. Job from it which was £500 so you could say that's the add paid for, but I'm crap at following up where jobs come from, so not not I had any other from it..
This year (since jan) as far as I know I've not had one job, but I could be wrong.
I been in it about 4 years running now and my feeling is it's got worse, I'm not sure anyone's using it now. It's like the dodo.
I'm surprised at the ones saying they do well out of it, maybe it's a area/demographic thing.