Padding Trust, ( at the very least), will skew others on the same Web Of Trust (WOT). Perhaps a Neutral should be used in many cases of personal opinion on a user. Examples: "I like what he said." , "I trust this person", "Sold a widget for 0.00001 BTC", "Great guy", and so on.
I have excluded several because a 1 trade, 2 post Newbie showed up as Trusted on my WOT.
Also, maybe the community should adopt a minimum buy/sell/trade value before actually handing out a Positive. I think this has been brought up before, IIR.