It's not about moving the share price with large orders,...

It's not about moving the share price with large orders, it's the signal it's gives to the market. Revealed preferences, putting their money where their mouth is. You don't throw $100k at something for nothing, have to remember that directors are significantly more exposed to the risks of this stock than we are. If the company goes bust they lose both their investment and main source of income, plus they are massively restricted in terms of when they sell. That money is essentially stuck in this now, there are only so many small windows when they can sell and even then, directors are ripped apart for selling regardless of the reason.