The Epic DM quest seems like an extreme outlying case, IMHO.
If you're lucky enough to live in Wisconsin or any surrounding area, you've got plenty of options to run the Epic -- it's been run at GameHoleCon and is planned to be run at GaryCon, plus other conventions around the area have requested it (including my own local con, Con of the North). Given that the admins are seriously promoting the ability of local conventions to both request and run the Epic as well as to create their own AL content, I expect this will become more common as time goes by, which makes it all the more important to correct the imbalance in DM gold now, before it becomes a bigger issue.
I haven't seen DM gold being an unstable effect in my experience.
I suspect you also haven't seen whooping cough or measles -- doesn't mean that not getting your immunizations is now a good idea.
I also don't accept player resentment as a reasonable cause to reduce DM rewards - if someone wants those rewards they can put in the work to get them, just like DMs do.
It's not a question of 'player resentment' -- it's mathematically provable that DMs get a far larger amount of gold for a given amount of XP than a player character gets for that same amount of XP. It's a question of game balance, though fairness could be argued to come into the comparison as well. I don't mind if DMs get a bonus amount of gold compared to PCs; the problem comes in when the difference is so large that DM PCs can trivally do things that non-DM PCs have to seriously work for.
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Pauper