Gosh,, I would never buy a new book each year,, do some of you really do that?
I mean,, the Eiffel Towers location hasn't changed,, same with Louvre and Orsay,, and as for opening times,, the books are less current then looking it up ONLINE,, and all major tourist sites seem to have webpages,, that will list up to date closures and exhibits,, which, no book can do.
I personally assume prices go up a little each year,, so if an attraction was 8 euros last year,, it may be 8.50 or even 9 this year,, but certainly won't have jumped by much more then that,, so its not going to break my budget figuring for a years price difference.
I find online resourses are so much more upto date and relevent( hey,, guess what,, Rick Steves Guide book does NOT tell you the Catacombs in Paris are closed due to vandalism,, so if you use his book , you may arrive to a closed venue anyways!)
What I do like and think is valuable about
Ricks books is the basic travel tips Rick gives,and I enjoy his commentaries and brief histories on sites,, and neither of those change much in ONE year.