Having only glanced at it quickly, it looks like worhiper_-_ backed out of a deal - nothing wrong with that.

If someone was scammed out of coins, a negative trust is warranted, and should be backed with a reference.

If no one lost anything and a deal went sour in due diligence (or whenever), everyone should just walk away.  In this case, a neutral would be more appropriate, warning others not to waste their time.