Not really surprised anymore because this has been discussed in the past but still perplexed why this is the case. I use the feature intensively and I find it useful. UX could be improved though, especially I'd like to be able to favorite a comment with a single click/tap, very much like voting up or down.
I guess there also are a lot more stories (over 24 million, it seems) than regular users. Even taking your 27 as the average per user, I would expect the average number of time an article gets favored to be significantly below 1.
Indeed I do have hundreds of favorites, going back till 2012. What you are looking at are just my favorited stories, but I have a lot more favorite comments. Funnily your comment kind of supports my point that the UX could be improved;-)
Also a disclaimer for those looking at my favorites: I use this feature much like a bookmarking service and for me a favorite means an endorsement only in the sense that I found the contribution interesting and valuable enough to be remembered.
I don't necessarily agree with what is said in the postings I favorite.