I think this is a catch 22. If its too easy people who really shouldn't be doing the Mentor roulette (people with no interest in actually Mentoring) will be queuing up, ruining the purpose of the Mentor roulette in the first place. On the flipside, they want to allow people who take the time and effort to actually Mentor to get some reward for their efforts.

Not a easy thing to do. Strickly speaking if its tied to the Mentor roulette it probably shouldn't be something that is really for being a 'goal'.

That said, 2000 does seem extremely excessive.