The Branding of Frida Kahlo
newrepublic.com
newrepublic.com
Productivity can also play a role. A lot of legitimately great artists also have/had workshops to help them produce more and also reuse/rework work for a lot of different purposes. Consider Rodin and Chihuly for example.
Seems to me that this also applies posthumously, but there are other people doing the branding for them.
I often see artists "discovered" by some curator or some other artist, then brought to the attention of the art world. The ones I'm aware of have traveling exhibits hitting major museums. There is money involved in this. There is a "conscious effort to actively create a contemporary following," in this as well. In a way, much of human culture, period, is tied up in branding and marketing. Even politics, which is a scary thought.
Creativity, productivity, hard work, or mastering something doesn't get you very far.
Isn't that part of the whole package?
"Oh, yes, I'd love to wear someone else's initials or sigil!"