>If I work at a bookstore and sell 10 $10 books, I do not receive $100. That’s what it means for a worker to receive the full value of the work they do. What would the business owner get under this arrangement, don’t know, the value of whatever books they sell also.

Then you have merely failed to understand the value of labor. The value of the labor of a clerk at a bookstore is not equal to value of the books she sells. The value of the book is precisely the sum of the values added by the author, the publisher, the distributors, the bookstore, and, yes, even the sales clerk. She gets compensated for her portion of that value.