Bleh. I gave up being a mentor. Most of the new players just ignored me or disappeared after a day or two, and the one guy that stuck around for all the lessons, who asked intelligent questions and who seemed genuinely happy about the game and the information I gave him, deleted his character several hours after the last lesson (without giving any mentor points, of course 
).
That's more or less my experience--a couple may have stuck around, but I haven't seen any points.
