I've seen a few of these spring up and then disappear over the years, sorry my opinion is that they simply dont work.
The problem is that customers just dont use them,
looking on the Internet came top
Yes sure, but looking on directory sites? I doubt it. More like google or yell maybe. The only way to make a directory site successful is to promote it with the general public, which is usually impossible as that would cost £millions, with no guarantee of a return.
Sorry to be negative, but i've seen this before, even really well designed ones, and they just dont work.