@RubyJones One of the erotica writers I met on Twitter, Alana Church, sells exclusively on Smashwords and makes good money. But I think it's a different game than Amazon. Especially if you don't want to do a lot of marketing, Amazon and KU is nice because it gives a little even if you don't advertise.
I personally just got tired of Amazon's bullshit and pulled my books from KU but it's not an easy decision to make if KU makes up a significant part of a writer's income.