So there are a few notes around that state the following:

Hidden Delver Service:
Got an item that you don't fully know?
Have you been enchanted but not sure with what?
Find out in 10 minutes for 5 gold or instantly for 25 gold!

This is basically here to make a more organized list of what to do. Also the difference in price is to encourage others to let Frances meditate as to not use up a spell slot.