here's where you show a lack of understanding for what "average" means. every single business is included in figuring the "average". so the small mom and pop store brings it down, while the middle sized walmarts and such bring it back up. the super users will also bring it up a lot more for sure, especially a large mining business with thousands of cards. so the way that math works and specifically the way "average" is computed, even something like a walmart type store would still likely fall under the average and not see a rate increase. i highly doubt a farm uses that much electricity and many actually already generate their own power using wind, solar and biodiesel made from waste products around the farm.
same goes for what the article is talking about which is homes. even a large home would not use the power of a mining set-up. the largest estates might bump above the overall average of the homes of the city, but i don't really care if they get penalized a bit for having 15000 sq ft homes to heat and cool 😛
and again, they are still not going to get anywhere near the usage of the miners. spend tons of money raiding and possibly prosecuting and such, or just price them out of the area. you can get with this or you can get with that.......
one of the actual problems with using "average" is actually a plus in this use case. the "median" in this case would largely benefit the large users, while the "average" would benefit all but the largest users, again in this use case.