1st of all, I'm highly skeptical that we get any major returns from escrow markers. But if we do, "they" have to know that a big share handout would result in a massive share selloff leading to immediate dramatic share price drop. It (pps) might recover quite quickly, but then again it may not, and that uncertainty means it's a destructive option.
If I woke up tomorrow with an extra 30000 (for example) wmih in my account as a result of a payout, I would immediately sell half of those and plan to buy back in when the price dropped by 50%. Basically I think there would be major chaos.