@jack Great minds. I did the same analysis today as my subscription will be renewing soon. Unfortunately(?) I own some of the big apps already (Clean My Mac, BusyCal, Forklift, Marked) but decided it was worth it for RapidWeaver and Ulysses alone. If the apps I own get paid version bumps then Setapp will increase its value as I can switch over to their version from my individual licenses.
@jack For me, it's all about Ulysses. While that is included then it's a great deal, but if I ever move away from it or it is no longer part of Setapp then it will be a harder call. I will say that I have started using apps like Numi that I hadn't heard of before purely because I get them for "free" now, which is great.