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... but ultimately the system is designed such that there is no incentive to actually, really be a mentor and help players through difficult content.
Why would a player sit around in one of the more difficult EX fights wiping for an hour only to get no progress towards their achievement when they can leave and get a 30 minute penalty instead? Even if they do stick around and manage to pull the group through with echo, coaching, or making sound macros to call out mechanics to really try to help these players through this content... all that's waiting for them is 1/2000, the same as a guildhest that takes less than 30 seconds and no effort.
The system is designed such the mentorship opportunities to help players through harder content is actually something to hope to avoid. All that would be needed to remedy a lot of this behavior is to actually give players a reason to stick around. I don't think making punishments more severe is appropriate, especially not with how mentor roulette is already regarded as an awful grind as is. Making it more painful is not a solution.
and here we have the real issue: SE does not want you to become a mentor just for crown, fame and chunky pegasus. these achievments are some kind of appreciation for your work for the community which most of those crown flexing jesters never did.