I've made it with 10Ah as well but carrying cameras and such it is nice being able to charge stuff up and also have battery enough to power my headlamp at night. I can understand why people want more charge.
Have you played any sandbox games more seriously and joined some guilds etc? I would say WoW was more of a "world" in the start (but not on a comparable level to others) and turned less and less so over time. The one thing blizzard always managed really well however is a crazy level of polish. I am sure they could make any kind of game really shine.
I was thinking of something similar recently as I am a big fanatic of PvP games of different kinds. Problem is as I get older I have less time to play to keep up with my enemies and would love to have "adult" servers which are only on at certain times of the day (maybe even with some auto grinding on the off hours). To allow people to be on more even footing. I bet there would be a decent chunk of people who would enjoy this.
Not true, EVE, Albion are like that (and probably a good number of others). Some survival type games with PvP features parts of that as well although they are regularly wiped. While the demand is smaller than mainstream MMOs the following is way more hardcore, there is a reason some of these games are going strong after 15-20 years.