The second highest pot game going right now, 1000

buy-in, was nto password protected.
I would be really unhappy if anyone with some real-life dollars to spend could have bought into that game. The buy-in, as it was, protected the interests of those of us who set it up.
As much as GR is the main ranking system on this site, or the one with the highest bragging right value, the point system still does serve an important purpose. People have to put in their time, prove their dedication and tehir competence level (or get lucky) to have the priviledge of playing in high pot games.
Furthermore, when buying into a high pot game you can usually also be pretty safely assured that the GR of opponents will be reasonably high. If people could buy points you could play a game for 3500

or whatever against people with GRs still around or below 100. This would also somewhat defeat the purpose of points, I think.