certainly $77,167 is a lot of money. but don't read too much into what directors do, his opinion might be wrong. also any loss he makes might be off set against gains elsewhere. below is moly's insider trading policy. read definitions of "Insider Trading", pages 1 & 2, particularly (c) and (d). it restricts what directors can do - if there was an advanced transaction it could breach this and also the corporations act.
directors buy shares for funny reasons, and some of them might not be as simple as you think.