When you consider the option shares that each of these people has at their disposal, and the idea that the shares they would be buying along the way would be increasing in value in order for the $312.5K to be an issue as you propose, what is the downside? That they can't commit to hundreds of thousands of dollars of purchasing 6 mos in advance? Perhaps you can characterize that as a downside or a "risk" to the BOD or Management member.
But the bottom line issue is that the goal and the idea of such a plan is to STOP the perception (real or not) that these people are milking PTSC for as much cash and option compensation that they can, while having no risk other than the gravy train ending should the company fail. And instead to REPLACE that perception with one of a group of directors and managers that are willing to INVEST in their own company beyond the point of exchanging work for compensation through a paying job, and in doing so, creating a perception that they REALLY believe in the plan they have proposed, and the comments they say, and the personnel they have hired, and the deals they have struck, and that they are committed to the best interests of ALL of the shareholders, and not just the interests of a few of them that they might represent.
They continue to ask us as shareholders to keep our personal cash at risk, despite their performance, and they continue to ask new investors to take on the same risk. This recent purchasing is a good first step, but a SUSTAINED pre-announced buying plan makes a much stronger statement and is a much more CONVINCING comment about their "investement" in the company. While not the perfect analogy, it's kind of the difference between babysitting and parenting, in my opinion. The parent deserves and commands much more respect and support.