I have to say as a businessman my early impressions of bitcoin as a medium for doing business with isn't good seems safe to assume everyone is a crook at worse or unprofessional at best until proved otherwise.
That is nothing specific to bitcoin. I get the impression that there is a lot of scams going on in the ebay/paypal world for example.
There are very professional people on ebay working hard to earn a good reputation, just as I imagine there are very professional bitcoin people here working hard to maintain their reputations.
I think it does help if you have a good trusted escrow service. The problem with ebay is that paypal is the defacto default escrow service, and they don't have a very good reputation of resolving disputes fairly.