So you're definition of a mentor is someone who will only help others if the reward is worth your time? Well I won't say you should change that ideal of yours because as a player it is your ideal to abide by, but that is far from how a true blue mentor should define themself. After all, we mentors help others because we want to, not for something in return. As for what you said about Mentor Roulette, well, that can apply to any roulette to be frank. However, it doesn't change the fact that Mentor Roulette queues you for what it does with the potential intent to help others clear it. After all, that is why everything in the game, even Guildhests, are part of it.