At the most basic level, I think it would give a basic sort of feedback as to how a creator’s page is faring. You may have only 1 patron, but 10 followers, which would be heartening and encouragement to continue. If some of those followers were also patrons of other creators, then it might also give a sense that such followers weren’t simply watching from the sidelines, but were considering pledging - perhaps. So, I think, when a page is just staring out (as mine is), then it could give some useful indicators.
I’ve noticed that many organisations have degrees of membership. My local art club holds classes, and you can just pay for the class, or become an ordinary member, senior member, keyholder, etc. I guess Patreon is similar: for every active paid up member there may be 20 watching from the sidelines, debating whether to commit, and for each of those another 100 who are happy to watch/consume, and movement between these groups might be fluid and changeable.
Anyway, perhaps this is all small fry for the larger creators - though I guess even for them a sudden upturn/downturn in non-pledging followers might indicate they were doing something right/wrong.
Using the lists to badger people (‘I see you’re following me!’) would be bad, I think, so there should be a means of following anonymously whilst appearing to the creator as a faceless statistic.
Anyway, just my thoughts.