Thousands of people make a living from the rake on stars anyways. Its pretty easy to get supernova and 100,000 fpp's = $1600 cash bonus.
So you're kinda right that noones gonna make a living from the rake if they're not supernova, but anyone serious about making a living from poker would manage supernova pretty quickly, it's why theres literally thousands of breakeven russian players that play short stacked etc.
I played about 4 and a half hours last night and got 3500 fpp's, if i did 9 hours a day for a month that'd be a tasty $3200 if i managed to break even at the tables, now think about all them breakeven russian short stackers, they can very easily 24+ table where i struggle playing more than 12, because they play a very robotic raise or fold game, so as much as they annoy me, i can see why they do what they do.