I had never played or read the Rise of the Runelords Adventure Path. Of course, I knew about it. Just didn't interest me as much as many other products, including the couple of APs I subscribed to.
But since I enjoy the Card Game so much, I went ahead and bought the Anniversary Edition PDF. Now I "get" the shopkeeper's daughter ally card and picture the Glassworks when I play that location.
At over 400 pages and currently 30% off, I think it's a decently priced purchase, though I certainly understand those who deem it too costly. But reading through the first three chapters, it has made the Card Game a bit more enjoyable. And since I don't plan on ever playing the AP, no fear of ruining stuff.
The quality of the Card Game led me to buy an AP I never would have gotten otherwise.