I think I cracked Nora and Nico code, I actually think their behavior can be explained when we look how they were growing up ( I'm obviously speculating here).
Nora growing up probably didn't receive much attention of boys, she was to them too scrawny, small and I know how boys can find girls with glasses too nerdy and struck up. but them she became a adult and with the help of the internet she discovered her looks have a certain appeal with a little work and you know what? she discovered she likes the attention, that's why she puts way more effort in the quality and quantity with her internet 'work'. ( see her JOIS, photos and videos compared to Nico.)
Nico on the other hand was the opposite of Nora growing up, she received TOO MUCH attention for boys, her body - primarily her breasts - developed too early and too much for her. Plus she being probably autistic and a lesbian you can imagine how difficult was her adolescence, I unfortunately wouldn't be surprised if she was sexually harassed at some point. You can also see in her 'work' she actually don't enjoy playing to heterosexual fantasies, she does the bare minimun but stills looks hella uncomfortable and consequently her output is vastly inferior in both quality and quantity compared to Nora. ( she probably only does OF shit because she can't do anything else)