[eozoon]

People who have not heard of King before Twitter and only hear of him from Twitter are not going to be the people buying his books.

So even if there were significant amount of people like you, he is not gaining anything from people seeing his Twitter. On the other hand, I have relatives who created Twitter accounts only to follow authors they like - the number of curated lists of notable literary figures is a testament to that fact.

I'm not saying Twitter is worthless to writers - readers talking about the books certainly helps sales, but that occurs regardless of whether the author themselves are on Twitter or not, and Twitter is certainly not the main platform people use to discuss books.