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Basically these directories were very useful at the start of the advertising boom, when people jumped all over them because they were the 'in thing' - and deemed fashionable, mainly as everything else was too expensive. We now have the web, so interest for these paper guys have reduced over the years.
If you do take out an advert with them, you will get about 40 enquiries per year, but not about your business or services. Salespeople use these directories as they are a good source of contact info, and is all too easy to extract phone numbers, email addresses etc.
You'll get major hassle from other businesses and the publications sales staff persuading you to upgrade your ad to their better ad space. My theory is Webfinder is trying to earn substantial cash by using it's paper directory's reputation to drive sales.
£500 per year for an ad in a paper directory ain't good, and would cover Yahoo's cost and another 4 entry fees to better online directories at least, where you'll get far better results for ya cash.
I don't know much about webfinder as I have never used them for the above reasons, but would you get back what you pay out with them. That's the question you have to ask.
The one I use is PPC & very good.