I wonder if they just got their annual bonus checks and Stoll insisted that they all put it into the stock. They put some nice coin into these purchases.
There's another way to view this of course (leave it to me to consider the dark side) - they realize that their options will never be worth much, but the stock could realistically make it into the $1.50-2.00 range in a buyout/merger, so rather than coming away with nothing they buy a load of shares at .50 cents. At least this way they profit on the shares, if not on the options.