You need to take into account that fan subscriptions are a miniscule percentage of the overall user base. It's not like an app store where a whopping 1/3 of use

You need to take into account that fan subscriptions are a miniscule percentage of the overall user base. It's not like an app store where a whopping 1/3 of users buy apps. Just because facebook has a larger userbase it doesn't mean people are going to use it "out of convenience". If creators don't see a financial advantage , they 'll redirect their sponsors to patreon or another cheaper medium.