That argument is sort of like a chess strategy that starts with "If I get four moves in a row, I can checkmate my opponent."

Nobody is denying the basic facts you've cited, so it'll be very hard for you to find someone whose ignorance of those facts you can use to your advantage. Groupon won't be as liquid as, e.g., AMZN. But buyers and sellers both know that.

And selling pressure is intrinsically short-term; Groupon's underlying value is completely independent of the number and motivation of selling shareholders. In a Bayesian sense, you could respond to insider selling--except that insiders are almost always selling, and the more successful the company is, the more they ought to sell. The biggest insider sellers are, by necessity, the founders of the biggest and most successful companies.