Wish there was a better proxy for the value of an artist than what their works sell for. For example, how many people did this guy influence, how did his work change art or how people understand the world? Neither was really discussed in the article
He also lived in Cleveland from about 1952-1961, which means there's a not insignificant chance he may have done work for American Greetings. Which means that maybe his art was on some number of cards that began or ended a relationship. That's an influence, I think? Probably an anonymous one, though.
It sounds like pretty much everything he's drawn or painted for himself is still in his apartment. So most of it hasn't had any chance to influence anyone or their understanding of the world. This may change now that he has people in the NYC gallery scene becoming interested in his work as a new artist to promote as worth investing in. Or it may not; the few pieces of his work shown in the article didn't strike me as saying anything that hasn't already been said a thousand times by the "New York School" of 50s/60s abstract expressionists that he exhibited next to back then. YMMV, abstract expressionism ain't my thing in general.
The fantastic site WikiArt includes influences, as seen here: