The first sentence specifies that "names of books are purchased every year" and implies a broader observation about the book market, while the second sentence focuses on the disparity between authors and profits.
In terms of effectiveness, it depends on the context and the message you want to convey:
- If the goal is to highlight the ongoing nature of book sales and the general trend in publishing, the first sentence may be considered more effective.
- If the aim is to draw attention specifically to the inequity faced by authors regarding profits, the second sentence is more effective.
Overall, they serve different purposes, so asking which is more effective depends on the intent of the communication.