Harsh criticism from CookieMonster.
My initial glance left me with absolutely no real idea what you offer beyond a directory of some kind. Does the world need another directory? I have no idea. Is that what you offer? A directory? Or do you offer something else? Convenience, speed ... what? What you offer is very important because it`s the only reason people share their money with you.
You need to *significantly* sharpen the front page copywriting to instantaneously communicate your offering. Even when you think it`s sharp, sharpen it again. And again. And again. And again. I like to follow the 4-second rule. Can the visitor learn about your product or service in four seconds or less? That`s tough to accomplish but can be done with any product or service. [I`m not so picky about subsequent pages but the front page really has to be mind catching.]
I think you should hire a professional copywriter. Or read a few books on copywriting if you haven`t already. There`s two key styles: deductive copywriting and inductive copywriting. Google these terms.
Here is an example of copywriting and design in which I have participated:
http://www.scenomics.com [Site isn`t quite complete, but you`ll get the idea.]
This company sells a complicated product that has many capabilities. Yet very little time is spent talking about anything beyond the mission: fast, accurate terrain generation. Anything else, really, is just a pointless distraction. I have a well-deserved reputation for being a minimalist. That wasn`t always the case. But in today`s over-communicated world [not my words], clarity really matters.
How are you going to spend the four seconds invested by your visitors? What are you doing to make them feel hot and bothered and interested? Right now... not a whole lot in my opinion.
Finally. The name is awful. Gut-wrenchingly awful. Platinum Business Network. Worn out, worn out, worn out. Your product idea is really good though. Platinum is an expensive metal. It`s rare. Are you trying to imply rarity? Exclusivity? If that`s what you`re using as brand attributes, then you need a different site design entirely. Look at chanel.com, armani.com, etc. Platinum Business Network is not memorable. What about pbnusa is memorable? Terrible stuff. Why not use something like "Platinum Bus" instead? That`s memorable. A platinum school bus or city bus is almost vivid. You could have a stylized logo of a platinum bus. I know it sounds ridiculous but people remember the ridiculous; they forget the generic.
If you`re interested in the entire "what you offer" -vs- "what you do" angle, and you should be, look at some of my other posts.
P.S. I purposefully used the phrase "Harsh Criticism from CookieMonster" in the opening so you could get an idea about memorable -vs- generic.