A differing point of view here - if you read of a bad reputation on the BOI, especially if there are several bad guy threads and they are long, it's someone that I stay away from.
It's been my experience that the main folks that post there, a person who logs a complaint has to provide detailed information about their transaction and answer just as many questions as the person being reported as a bad guy (unless they've already been established as one).
There are unfortunately a lot of bad guys out there, and it's best to always ask around if you aren't personally familiar with the seller. The good thing is, there are a lot of good guys too. Always be an informed buyer!