TANSTAAFL
There ain't no such thing as a free lunch.
If you pay the AG subscription price ($99) I believe, then the blue book access is included. however, it is not free. If blue book charges AG or any other service, you can bet that they will try to recover their fee via their members.
I look at Hifishark on occasion. however, they don't tell me the low, average and high prices of an item.
I typically price items to sell, so I price at or around the average blue book price. For that I need the blue book. This is also why I don't have much room for adjusting the price. I'm not going to give a piece away and I'm also not trying to gouge anyone.
enjoy