Currently, an entrance ticket to Faneuil Hall Marketplace costs USD 5.00. Guided Faneuil Hall Marketplace tours start around USD 5.00 per person.
That is expensive. No wonder that the place was almost empty (there are only a few people on your photo). I would rather spend that (or rather even less than that) on a good lunch. And I actually did it today for $4.61 USD:
I tried Thai food for the first time in my life - #MarketFriday (2021.11.19).