As stocks keep trending higher, insiders continue to exercise restraint. While their defensive posture has stabilized (and indeed lessened a tad) over the past few weeks, it seems that corporate executives, directors and beneficial owners view overall stock valuations as likely extended. That attitude appears to be mirrored in the broader market. Investors are clearly willing to push share prices higher, but the selling days (when they do occur) tend to involve noticeable drops -- suggestin