In reading Rick’s guidebooks I notice that he always clearly explains and marks where the tourist info office is in every town. The only time I’ve used these offices is when they sell some sort of combo sightseeing pass or ticket that is not sold in other places. I can actually only think of one such example - Salzburg for the Salzburg card - but there may be other similar examples im forgetting.
So - are these commonly used by other travelers? For what and do you find them valuable? Note I mean the town office, not the visitor center for a specific sight. Those I use often.