Jokes aside, I feel like if the dopamine hit of merely browsing Lemmy and finding posts and communities you like, and enjoying good debates does not exceed the hit for defederating everyone, then you're doing it wrong.
I have my instance publically available, and been using Lemmy through it since.
I have a couple of local communities (non-private) that I hope people start using, but hard being discovered, it seems.
Started out with 1.6G usage day one, and since then I have grown to 1.96G.