Here's why:
* "Well-thumbed" implies that the brochure has been physically touched and turned through many times, leaving behind evidence of those actions.
* "Thumbed" specifically points to the use of the thumb, which is often the dominant finger used for turning pages.
* "Well" signifies that this thumbing has been extensive and frequent.
Therefore, a well-thumbed brochure suggests:
* High interest: People have found the brochure's content engaging and worth exploring.
* Popularity: The brochure has been distributed widely and has attracted a significant audience.
* Effectiveness: It has likely achieved its intended purpose of informing and attracting potential customers or clients.
Think of it as a physical sign of the brochure's success.