I don't know who DaveF is or what he's done for Bitcoin or this forum either, but I did notice he's (presumably a man with the name Dave) in DefaultTrust and has also chosen to exclude my trust network.  Given that I have probably one of the most friendly trust networks on this site and have one of the longer trading histories here (arguably the longest with so many trust ratings) so you have to assume the guy makes decisions based on some weird personal feelings or emotions.  That or he's just plain a bad judge of things that happen around here.  I guess take some solace in knowing you aren't alone in your curiosity of DaveF's use of the trust system.